my IC7-G config with Corsair XMS RAM

hello,

Abit IC7-G max II

I bought Corsair XMS CMX512-4000 x2 RAM thinking it was
PC-4000, but CPUZ reads it as PC-3700.

I thought I got ripped off since I was unable to
oc it past fsb=240, 1:1

After some frustrating days, I went back to the Corsair site and
saw (to my surprise) that all of their specs are at DRAM voltage= 2.75+

Once I raised my CPU voltage to 1.33 and DRAM to 2.8,
I was able to oc to 250 (DDR500 yes!) and 1:1

I pass all tests in memorytest-x86 and get no errors in HL2.

For more system details I made a page with CPUZ screens
http://67.49.101.245/abit_ic7/IC7Spec.htm

regards,
tlviewer

"tlviewer" wrote in message...
> hello,
>
> I bought Corsair XMS CMX512-4000 x2 RAM thinking it was
> PC-4000,

It is.

> but CPUZ reads it as PC-3700.

Just to calm any worries you may have had about being sold a wrong 'un, many
brands of memory actually carry deliberately "non-accurate" SPD data, partly
because there are no officially defined JEDEC standards for PC4000 and
PC4400. To maximise motherboard compatibility, memory manufacturers often
apply deliberately conservative values to the SPD data, giving you plenty of
room to manually tighten the timings in the BIOS.

This solves a problem that used to occasionally pop up, where "accurate" SPD
values could cause some motherboards to fail to POST.

> After some frustrating days, I went back to the Corsair site and
> saw (to my surprise) that all of their specs are at DRAM
> voltage= 2.75+

It's also pretty much par for the course to run 2.7 to 2.8 volts on an IC7
series motherboard, no matter what the rated voltage of the memory.

You will probably find that your memory will run stably at well in excess of
its current working speed. The XMS4000 I used to own would do 263MHz at 2.8
volts with 100% success in Memtest.
--


Richard Hopkins
Cardiff, Wales, United Kingdom
(replace nospam with pipex in reply address)

The UK's leading technology reseller www.dabs.com