[Buffyfan]

I have a PC running 256MB DDR266 RAM. I want to put 1GB in it, but the DDR266 RAM is really expensive. I've been told that I can use DDR400 RAM (much cheaper), and it will run at a lower speed. Is the 400 a good (or even possible) solution, or am I better to go for the DDR266. Will 1GB of DDR266 will be quicker than 1GB of DDR400 running underclocked,or would the 400 run at 266? It's an AMD Athlon 1.7 GHz CPU. Any advice appreciated thanks

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Either will give same performance on your PC. You just need to be sure that your system really does support DDR400, and that each individual slot can address 1Gb (some older slots can only address 512Mb each, even though a 1Gb module will physically fit in it).

To be absolutely sure of your system's memory compatibility I suggest you go here:
http://www.crucial.com and click their online "Scan My System" link.

[pip22]

Either will give same performance on your PC. You just need to be sure that your system really does support DDR400, and that each individual slot can address 1Gb (some older slots can only address 512Mb each, even though a 1Gb module will physically fit in it).

To be absolutely sure of your system's memory compatibility I suggest you go here:
http://www.crucial.com and click their online "Scan My System" link.

[Buffyfan]

Awesome, thanks very much. I'll do that