A single 2GB DDR2 PC6400 memory module, assembled by the good people at PNY. Specs are -
* Main Specifications:
* Memory Size: 2GB
* Memory Type: PC6400 DDR2
* Memory Speed: 800MHz
* Form Factor: 240pin for Desktop Computers
* Compatible With:
* DDR2 PC2-4200 (533 MHz Bus Speed)
* DDR2 PC2-5300 (667 MHz Bus Speed)
* DDR2 PC2-6400 (800 MHz Bus Speed)
For the normal people reading, if your system has a Core2Duo, Core2Quad, AthlonX2, or Phenom CPU in it, there's a 90% chance that this RAM will work in your system. To be sure, check out your system's spec - if it says DDR2 (of any speed - 4200, 5300, or 6400), this should work. You're better off buying a single 2GB module than two1GB modules because PCs only have capacity for a certain number of modules, usually only 2 or 4, so buying bigger modules gives you more room for expansion. They're cheaper than most 2x1GB sets, too.
Before you buy this, watch out - if you're running Windows XP 32bit or Vista 32bit, although you can install as much memory as your system can accomodate, Windows itself will be limited to being able to access only around 3.25GB of it. The only way around this memory limit is to use Windows XP or Vista in their 64bit formats. So if you've currently got 3GB installed, there's no point adding any more.
For the more nerdily inclined, two of these modules together will work perfectly in dual channel mode, and timings are a fairly standard 5-5-5-18. I have a pair of these myself, and they're excellent. No, they're not Corsair, but for the nerds who've outgrown the "Oh lol my ram is called EXTREME DOMINATOR EDITION iiI IT IS BETTER THAN URS" phase, this should pose no problem.
To get the £21.85 price, you'll need to use the 5% off voucher code, which is 'experience08'. If you've already used this voucher code, the modules are still only £23. Still, that ought to be enough for you savages to vote this one cold - I eagerly await my -73c rating :p