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pc memory question

Dub1 Avatar
7y, 11m agoPosted 7 years, 11 months ago
Brother has an older system with the older DDR memory installed

@ the moment he has 2 x 512mb ddr 2700 166mhz

he has found a stick of ddr 3200 400mhz

does anyone no if he can add the memory to his system as i no some memory can go backwards as well

crucial.com says the following

Q: What memory goes into my computer, and can I mix speeds?

A: DDR memory with support for DDR PC2700,DDR PC3200 speeds.

but what confuses me is i had some of the following memory brand new sealed and spare 1GB DDR PC3200 400Mhz DIMM RAM yet when installed on his system he gets a blue screen just after the xp load screen, 99% sure it aint faulty memory as i placed it in his 2nd system and it worked fine
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Dub1 Avatar
7y, 11m agoPosted 7 years, 11 months ago
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#1
Its backwards compatable but some motherboards can be fussy with mixing, also if your mixing it might try to set the speed to the faster stick. Did you try different slot combinations and the faster stick on its own?
#2
yea tried it with the pair of faster sticks, then swap the sticks round then tried it with one stick @ a time, any ideas on how to change the memory speed is that done via the bios, the memory went into his 2nd system and worked from boot so i am 99% sure it aint faulty memory, and again his old memory went into his old system and it worked right away again, i was wondering could it be that one is pc 3200 400mhz and the other is pc2700 166mhz
#3
jah128
Its backwards compatable but some motherboards can be fussy with mixing, also if your mixing it might try to set the speed to the faster stick. Did you try different slot combinations and the faster stick on its own?


Sorry but thats the other way round you have to set the memory to the slowest module installed anyways just set by SPD in bios that way the frequency and the cas values are read from modules and bios should auto drop all sticks to same speed.

and also install the memory so it is not running in dual channel mode as that generally requires for 100% compatibility that both are as identical as possible so run in single channel mode 64bit on post if it says dual channel mode or 128bit you need to change 1 of the memory modules to another slot
#4
is the method via the bios done with the new memory installed as i just booted the system with the memory he had installed (that was 100% working) and i see an option about speed and it says 333mhz but its grey out like a disabled option i cant select, the newer sticks he as is pc 3200 400mhz and his old ones are pc 2700 and 333mhz (crucial says 166mhz) another thing i dont no if it helps but when we put in both the new sticks the pc starts but there is nothing on the tft no image and no beeps, when we use one old stick one new stick it boots gets to xp screen and then gets a blue screen
#5
dontasciime;3827509
Sorry but thats the other way round you have to set the memory to the slowest module installed anyways just set by SPD in bios that way the frequency and the cas values are read from modules and bios should auto drop all sticks to same speed.


Yeah sorry meant slowest speed obv, bit of verbal diarrhea there!:oops: Lots of biosses default to the SPD settings on the memory in the first slot, not necessarily the slowest...
#6
jah128
Yeah sorry meant slowest speed obv, bit of verbal diarrhea there!:oops: Lots of biosses default to the SPD settings on the memory in the first slot, not necessarily the slowest...



Never seen that and that defeats the purpose of serial presence detect and highly unlikely that any mobo that has a bios that does that is stable or even possible ddr 266 does not like to be run at 400 or even 333 so how the hell any board boots with a bios that only sets SPD on first Dimm and therefore corresponding dimms all run like that, none of the 200+ computers I have built up for people and the 15 I have myself work like that
#7
Dub1
is the method via the bios done with the new memory installed as i just booted the system with the memory he had installed (that was 100% working) and i see an option about speed and it says 333mhz but its grey out like a disabled option i cant select, the newer sticks he as is pc 3200 400mhz and his old ones are pc 2700 and 333mhz (crucial says 166mhz) another thing i dont no if it helps but when we put in both the new sticks the pc starts but there is nothing on the tft no image and no beeps, when we use one old stick one new stick it boots gets to xp screen and then gets a blue screen



166x2 is 333


you really need to find 1 stick that works and go from there if you have pc 2100 and pc 2700 266 and 333 your bios will take care of the memory frequency on SPD or AUTO however do not run in dual channel mode with them.

Mixing memory on some mobos can be tricky , your mother board/chipset might also not like high density memory.


I have re- read your description and using 3 dimms can make it even worse.

As above mobos can be picky you tried your 1 gig in his crashed , High Density maybe.

Give up or research the board and chipset and check memory compatibility list with motherboard manufacturer

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