Pqi Ram

[technophreak]

I was wondering if PQI RAM was any good. I need a 512mb stick to last me a few months until I can afford a good 2gb Dual-Channel kit.

I've got an Opteron 146 with an Asrock DualSata939 board. I want to overclock it to ~2.5ghz (CABNE 0544 EPMW) and am wondering a PQI 512MB DDR400 CL2.5 16CHIP stick would be ok for this. I'd buy the Corsair ValueSelect from Scan but they don't open until January 3rd now and I need the RAM asap.

[manwithnoname]

**disclaimer I do not have an AMD64 system I could be wrong**

From what I have read on websites and forums overclocking an AMD64 CPU does not mean you have to overclock the memory, you just been to select a different 'memory divider' or 'ran ratio'.

Page 4 of the link below should help it's about Athlon X2 Overclocking but the same stuff should apply to your CPU.

http://www.anandtech.com/cpuchipsets...oc.aspx?i=2650

[technophreak]

I've been looking at A64 overclocking and didn't really understand the memory divider bit. Will running my memory at stock speeds affect my overclock at all?

edit: I can get some Twinmos ram for the same price. After looking around, it seems like it is BH-5. Would this be a better bet?

[fredered]

the memory divider will make your ram slower than your f.s.b. which is what you overclock. The ram will normally run in a 1:1 ratio with the f.s.b. at 200mHz you can set a divider so that the memory runs slower i.e. 166 or 133 mHz at a deafault f.s.b. when you up the f.s.b. the memory speed also rises but if you use the divider not at such a high rate and from a lower value. That means you can get your overclock without increasing your memory above the garanteeded 200 mHz. [As the memory is DDR you can double the frequencies to give the effective speed.]

Hope that is clear and helps [it probably failed on both counts]

[technophreak]

It did help. Thanks. Do you know if PQI or TwinMOS are a better option? Should I use a divider that gets my RAM as close to 200mhz as possible when I find the CPU max?

[Hans Voralberg]

I'll go with TwinMos if it's BH-5, cause part from BH-5, CH-6 and TCCD i havent came across a chip that can do 250Mhz with DDR400 rating. And yeah the closer you get to 200Mhz the better (obvious, no?) And hey if you got a CABNE it shouldnt run @ 2.5, push it roung 2.8 or try 3.0

[technophreak]

I'll go for the TwinMos then. My motherboard seems to be stable at 274HTT at max so 2.8 or 3ghz might be out of reach for me unless I can get the OCW Beta2 BIOS to be stable at higher HTT.

[technophreak]

I got the TwinMos and I'm impressed with it. It's completely stable at 245mhz. Tried SuperPI, prime95 and memtest on it. Not bad for £26