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How much RAM can my mobo handle?

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I have a 64 W7 PC so can take as much RAM as I want (in theory) but my mobo doesn't seem to like it. I have 2 x 2GB X Brand and 2 x 2GB Y Brand sticks in XYXY format (as colour coded on my board) b…
imnotlikeyou Avatar
2m, 1w agoPosted 2 months, 1 week ago
I have a 64 W7 PC so can take as much RAM as I want (in theory) but my mobo doesn't seem to like it.

I have 2 x 2GB X Brand and 2 x 2GB Y Brand sticks in XYXY format (as colour coded on my board) but only the X brand are being shown in Windows, CPUz and the crucial scan.

I have CPUz which shows as single channel and 4GB but my mobo specs (https://www.cnet.com/products/hp-compaq-business-desktop-dc7800-core-2-quad-q6600-2-4-ghz-monitor-none-series/specs/) show 4 slots for 8GB memory.

the crucial scan doesn't show the 2 empty slots of RAM (should it?), only shows the 2 full slots.

Is there something up my with board or bios? I haven't updated the bios since I got the PC.
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imnotlikeyou Avatar
2m, 1w agoPosted 2 months, 1 week ago
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#1
just checked another pc and scan shows the computer of having 4 slots so why doesn't it show it on mine?
#2
imnotlikeyou
just checked another pc and scan shows the computer of having 4 slots so why doesn't it show it on mine?
Your form factor? Max RAM for USDT = 4GB or SFF and CMT = 8GB according to page 2-3 of tech ref guide.
#3
Have you checked both X and Y brands work separately and that they are of the same type? (DDR2 Non ECC / ECC Reg)?

Edited By: drasim on Dec 14, 2016 18:32
#4
AndyRoyd
imnotlikeyou
just checked another pc and scan shows the computer of having 4 slots so why doesn't it show it on mine?
Your form factor? Max RAM for USDT = 4GB or SFF and CMT = 8GB according to page 2-3 of tech ref guide.

not SFF, large "full size" case
#5
drasim
Have you checked both X and Y brands work separately and that they are of the same type? (DDR2 Non ECC / ECC Reg)?

Yes they both work independently, it seems like the mobo is single channel and not double but still has 4 slots. and are both DD2 PC2 6400 non ecc

Edited By: imnotlikeyou on Dec 14, 2016 18:41
#6
It's unlikely that a bios will have been made for a few years, so it may be already up to date but it would be worth checking anyway
#7
imnotlikeyou
drasim
Have you checked both X and Y brands work separately and that they are of the same type? (DDR2 Non ECC / ECC Reg)?
Yes they both work independently, it seems like the mobo is single channel and not double but still has 4 slots. and are both DD2 PC2 6400 non ecc
The channels don't matter in this context, the ram will just be a little slower. Try it in a different order like XXYY.
#8
dcx_badass
imnotlikeyou
drasim
Have you checked both X and Y brands work separately and that they are of the same type? (DDR2 Non ECC / ECC Reg)?
Yes they both work independently, it seems like the mobo is single channel and not double but still has 4 slots. and are both DD2 PC2 6400 non ecc
The channels don't matter in this context, the ram will just be a little slower. Try it in a different order like XXYY.

will do, but the scan checker doesn't show my 4 slots (2 full and 2 empty) like my other machine

http://uk.crucial.com/gbr/en/scanview/A8DB4F7B31D926C3

The specs for my mobo are http://www.game-debate.com/motherboard/index.php?mot_id=1991&motherboard=HP%200AACh showing 4 slots should be available
#9
imnotlikeyou
AndyRoyd
imnotlikeyou
just checked another pc and scan shows the computer of having 4 slots so why doesn't it show it on mine?
Your form factor? Max RAM for USDT = 4GB or SFF and CMT = 8GB according to page 2-3 of tech ref guide.
not SFF, large "full size" case
HP don't list such an item, only small form factor (SFF), ultra-slim desktop (USDT), convertible mini tower (CMT). Assuming CMT, max = 8GB and the memory configuration can be viewed at page 11 of chunky 21MB PDF at https://www.pcarena.hu/pdf/osszetevok/alaplap/41.pdf
#10
AndyRoyd
imnotlikeyou
AndyRoyd
imnotlikeyou
just checked another pc and scan shows the computer of having 4 slots so why doesn't it show it on mine?
Your form factor? Max RAM for USDT = 4GB or SFF and CMT = 8GB according to page 2-3 of tech ref guide.
not SFF, large "full size" case
HP don't list such an item, only small form factor (SFF), ultra-slim desktop (USDT), convertible mini tower (CMT). Assuming CMT, max = 8GB and the memory configuration can be viewed at page 11 of chunky 21MB PDF at https://www.pcarena.hu/pdf/osszetevok/alaplap/41.pdf

CNET show it as my opening post - https://www.cnet.com/products/hp-compaq-business-desktop-dc7800-core-2-quad-q6600-2-4-ghz-monitor-none-series/specs/#p=hp-compaq-business-desktop-dc7800-core-2-quad-q6600-2-4-ghz-4-gb-500-gb-ak683usaba/

Edited By: imnotlikeyou on Dec 14, 2016 19:04
#11
imnotlikeyou
I have a 64 W7 PC so can take as much RAM as I want (in theory)

Windows 7 64-bit has some pretty low memory limits of it's own. Home Basic is limited to 8GB while Home Premium is limited to 16GB. That's not the issue here though.

The Core 2 chips have an external memory controller so it's not likely to be a CPU limitation either.

imnotlikeyou
drasim
Have you checked both X and Y brands work separately and that they are of the same type? (DDR2 Non ECC / ECC Reg)?
Yes they both work independently, it seems like the mobo is single channel and not double but still has 4 slots. and are both DD2 PC2 6400 non ecc

Do two sticks work if you put them in the other pair of slots?

Does it work if you have a single X stick and a single Y stick together?

What happens if you use a pair of sticks and have them in different colour slots? Does the board operate in dual channel mode?
#12
imnotlikeyou
AndyRoyd
imnotlikeyou
AndyRoyd
imnotlikeyou
just checked another pc and scan shows the computer of having 4 slots so why doesn't it show it on mine?
Your form factor? Max RAM for USDT = 4GB or SFF and CMT = 8GB according to page 2-3 of tech ref guide.
not SFF, large "full size" case
HP don't list such an item, only small form factor (SFF), ultra-slim desktop (USDT), convertible mini tower (CMT). Assuming CMT, max = 8GB and the memory configuration can be viewed at page 11 of chunky 21MB PDF at https://www.pcarena.hu/pdf/osszetevok/alaplap/41.pdf
CNET show it as my opening post - https://www.cnet.com/products/hp-compaq-business-desktop-dc7800-core-2-quad-q6600-2-4-ghz-monitor-none-series/specs/#p=hp-compaq-business-desktop-dc7800-core-2-quad-q6600-2-4-ghz-4-gb-500-gb-ak683usaba/
First spec item on CNET webpage: Product Form Factor - Convertible mini tower
#13
EndlessWaves
[quote=imnotlikeyou]
Do two sticks work if you put them in the other pair of slots?
Does it work if you have a single X stick and a single Y stick together?
What happens if you use a pair of sticks and have them in different colour slots? Does the board operate in dual channel mode?

If I change from X to Y the pc boots up, so the RAM is fine, the issue from what I can see is that nothing is seeing the other 2 slots being used (see my scan report link)

I can't remember checking if they work alternate colour slots but see above.

Edited By: imnotlikeyou on Dec 14, 2016 19:07
#14
AndyRoyd
imnotlikeyou
AndyRoyd
imnotlikeyou
AndyRoyd
imnotlikeyou
just checked another pc and scan shows the computer of having 4 slots so why doesn't it show it on mine?
Your form factor? Max RAM for USDT = 4GB or SFF and CMT = 8GB according to page 2-3 of tech ref guide.
not SFF, large "full size" case
HP don't list such an item, only small form factor (SFF), ultra-slim desktop (USDT), convertible mini tower (CMT). Assuming CMT, max = 8GB and the memory configuration can be viewed at page 11 of chunky 21MB PDF at https://www.pcarena.hu/pdf/osszetevok/alaplap/41.pdf
CNET show it as my opening post - https://www.cnet.com/products/hp-compaq-business-desktop-dc7800-core-2-quad-q6600-2-4-ghz-monitor-none-series/specs/#p=hp-compaq-business-desktop-dc7800-core-2-quad-q6600-2-4-ghz-4-gb-500-gb-ak683usaba/
First spec item on CNET webpage: Product Form Factor - Convertible mini tower

I wouldn't call it a mini tower, it's heavy as hell ha
#15
AndyRoid, using your link, on page 5 it shows the model number and I checked it against the one on my base and this pc is a 2 x 2GB memory module. so the 2 extra slots are useless (there for show I guess).

We got there in the end, I need to find 2 x 4GB RAM instead of 4 x 2 GB......

thanks everyone
#16
imnotlikeyou
AndyRoid, using your link, on page 5 it shows the model number and I checked it against the one on my base and this pc is a 2 x 2GB memory module. so the 2 extra slots are useless (there for show I guess).
We got there in the end, I need to find 2 x 4GB RAM instead of 4 x 2 GB......
thanks everyone
Please recheck the option of 2 x 4GB as there is no provision for such a configuration quoted in the previously mentioned page 11 of chunky 21MB PDF at https://www.pcarena.hu/pdf/osszetevok/alaplap/41.pdf
#17
AndyRoyd
imnotlikeyou
AndyRoid, using your link, on page 5 it shows the model number and I checked it against the one on my base and this pc is a 2 x 2GB memory module. so the 2 extra slots are useless (there for show I guess).
We got there in the end, I need to find 2 x 4GB RAM instead of 4 x 2 GB......
thanks everyone
Please recheck the option of 2 x 4GB as there is no provision for such a configuration quoted in the previously mentioned page 11 of chunky 21MB PDF at https://www.pcarena.hu/pdf/osszetevok/alaplap/41.pdf

The way I read that as that's the initial configuration e.g. this pc came with 2 x 2GB and I added the additional 2GB, but I can have a maximum of 8GB so I could add 2 x 4GB
#18
imnotlikeyou
AndyRoyd
imnotlikeyou
AndyRoid, using your link, on page 5 it shows the model number and I checked it against the one on my base and this pc is a 2 x 2GB memory module. so the 2 extra slots are useless (there for show I guess).
We got there in the end, I need to find 2 x 4GB RAM instead of 4 x 2 GB......
thanks everyone
Please recheck the option of 2 x 4GB as there is no provision for such a configuration quoted in the previously mentioned page 11 of chunky 21MB PDF at https://www.pcarena.hu/pdf/osszetevok/alaplap/41.pdf
The way I read that as that's the initial configuration e.g. this pc came with 2 x 2GB and I added the additional 2GB, but I can have a maximum of 8GB so I could add 2 x 4GB
Suggest you proceed with caution as the manufacturer lists only one option for total 8GB and that is 4 x 2GB. Polite repeat to view all the configs quoted by manufacturer at page 11 of chunky 21MB PDF at https://www.pcarena.hu/pdf/osszetevok/alaplap/41.pdf
#19
AndyRoyd
imnotlikeyou
AndyRoyd
imnotlikeyou
AndyRoid, using your link, on page 5 it shows the model number and I checked it against the one on my base and this pc is a 2 x 2GB memory module. so the 2 extra slots are useless (there for show I guess).
We got there in the end, I need to find 2 x 4GB RAM instead of 4 x 2 GB......
thanks everyone
Please recheck the option of 2 x 4GB as there is no provision for such a configuration quoted in the previously mentioned page 11 of chunky 21MB PDF at https://www.pcarena.hu/pdf/osszetevok/alaplap/41.pdf
The way I read that as that's the initial configuration e.g. this pc came with 2 x 2GB and I added the additional 2GB, but I can have a maximum of 8GB so I could add 2 x 4GB
Suggest you proceed with caution as the manufacturer lists only one option for total 8GB and that is 4 x 2GB. Polite repeat to view all the configs quoted by manufacturer at page 11 of chunky 21MB PDF at https://www.pcarena.hu/pdf/osszetevok/alaplap/41.pdf

I was sold this pc about a year ago based on it being able to take 8GB of RAM so if it can't I am going to be mightily **** off.......... hmmmm

https://www.cnet.com/products/hp-compaq-business-desktop-dc7800-core-2-quad-q6600-2-4-ghz-monitor-none-series/specs/#p=hp-compaq-business-desktop-dc7800-core-2-quad-q6600-2-4-ghz-4-gb-500-gb-ak683usaba/ shows as 4GB installed and Max 8GB so I am going to give it a try, will buy some cheap RAM and see if it handles it.

Thanks for your help Andy
#20
imnotlikeyou
AndyRoyd
imnotlikeyou
AndyRoyd
imnotlikeyou
AndyRoid, using your link, on page 5 it shows the model number and I checked it against the one on my base and this pc is a 2 x 2GB memory module. so the 2 extra slots are useless (there for show I guess).
We got there in the end, I need to find 2 x 4GB RAM instead of 4 x 2 GB......
thanks everyone
Please recheck the option of 2 x 4GB as there is no provision for such a configuration quoted in the previously mentioned page 11 of chunky 21MB PDF at https://www.pcarena.hu/pdf/osszetevok/alaplap/41.pdf
The way I read that as that's the initial configuration e.g. this pc came with 2 x 2GB and I added the additional 2GB, but I can have a maximum of 8GB so I could add 2 x 4GB
Suggest you proceed with caution as the manufacturer lists only one option for total 8GB and that is 4 x 2GB. Polite repeat to view all the configs quoted by manufacturer at page 11 of chunky 21MB PDF at https://www.pcarena.hu/pdf/osszetevok/alaplap/41.pdf
I was sold this pc about a year ago based on it being able to take 8GB of RAM so if it can't I am going to be mightily **** off.......... hmmmmhttps://www.cnet.com/products/hp-compaq-business-desktop-dc7800-core-2-quad-q6600-2-4-ghz-monitor-none-series/specs/#p=hp-compaq-business-desktop-dc7800-core-2-quad-q6600-2-4-ghz-4-gb-500-gb-ak683usaba/ shows as 4GB installed and Max 8GB so I am going to give it a try, will buy some cheap RAM and see if it handles it.
Thanks for your help Andy
Excluding physical failures, I have every faith it will accommodate total 8GB, but only in a 4 x 2GB configuration as per manufacturer spec. Consider the Crucial scan that you linked to does not include a 2 x 4GB option which further indicates 2 x 4GB is not supported.
If you want to cover as many bases as possible, it would be prudent to purchase 4 x 2GB from a reputable source (maybe Crucial), and if the total 8GB of the same brand/type is then not available, you may then have every right "to be mightily **** off."
My honest opinion for what it's worth: only configure to what the manufacturer states. Your current issue may be that the two brands of memory do not play ball together.
#21
AndyRoyd
imnotlikeyou
AndyRoyd
imnotlikeyou
AndyRoyd
imnotlikeyou
AndyRoid, using your link, on page 5 it shows the model number and I checked it against the one on my base and this pc is a 2 x 2GB memory module. so the 2 extra slots are useless (there for show I guess).
We got there in the end, I need to find 2 x 4GB RAM instead of 4 x 2 GB......
thanks everyone
Please recheck the option of 2 x 4GB as there is no provision for such a configuration quoted in the previously mentioned page 11 of chunky 21MB PDF at https://www.pcarena.hu/pdf/osszetevok/alaplap/41.pdf
The way I read that as that's the initial configuration e.g. this pc came with 2 x 2GB and I added the additional 2GB, but I can have a maximum of 8GB so I could add 2 x 4GB
Suggest you proceed with caution as the manufacturer lists only one option for total 8GB and that is 4 x 2GB. Polite repeat to view all the configs quoted by manufacturer at page 11 of chunky 21MB PDF at https://www.pcarena.hu/pdf/osszetevok/alaplap/41.pdf
I was sold this pc about a year ago based on it being able to take 8GB of RAM so if it can't I am going to be mightily **** off.......... hmmmmhttps://www.cnet.com/products/hp-compaq-business-desktop-dc7800-core-2-quad-q6600-2-4-ghz-monitor-none-series/specs/#p=hp-compaq-business-desktop-dc7800-core-2-quad-q6600-2-4-ghz-4-gb-500-gb-ak683usaba/ shows as 4GB installed and Max 8GB so I am going to give it a try, will buy some cheap RAM and see if it handles it.
Thanks for your help Andy
Excluding physical failures, I have every faith it will accommodate total 8GB, but only in a 4 x 2GB configuration as per manufacturer spec. Consider the Crucial scan that you linked to does not include a 2 x 4GB option which further indicates 2 x 4GB is not supported.
If you want to cover as many bases as possible, it would be prudent to purchase 4 x 2GB from a reputable source (maybe Crucial), and if the total 8GB of the same brand/type is then not available, you may then have every right "to be mightily **** off."
My honest opinion for what it's worth: only configure to what the manufacturer states. Your current issue may be that the two brands of memory do not play ball together.

I would say that is the case but both CPUz and Crucial don't show the other RAM slots so it sounds like I have the 2 x 2GB (max 8GB) model, will cost me £10 or so from ebay for the RAM so going to give it a try, if not can sell it back on or use it in another machine :)

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