Best ramtimings for I865Pe/875p?

[Willemoes]

Hi

I have the Ic7-G and 2x512Mb Ballistix Pc4000, currently running at 245Mhz, 1:1, 2.5-3-3-6 stable. I know tightest timings would be 2-2-2-5 but I read somewhere that lowering either "Ras to Cas delay" or "Ras Precharge" is more effective on P4 boards than lowering "Cas latency" (which is not possible with my ram@245). Does anyone know about this?


Regards, Finn

[flapperhead]

bump up the vdimm as far as it will go(probably 2.85 volts). u should be able to run 2.3.2.5 or 2.5.3.2.5 into the 250/260's .the afore mentioned timings are just about as good as 2.2.2.5 for intel 865/875 chipsets.. welcome to the forums my friend!!!!!!!!!

[Willemoes]

Thanks.

Do You happen to have a link or is it based on testing the bandwith?
I´ve changed my signature and I´m afraid my board or Cpu (Sl6Wu) won´t run 250.
Will try lowering "Ras precharge" and test with Sandra.

Regards, finn

[flapperhead]

actually u may do even better than i stated. heres some testing results at anandtech.. http://www.anandtech.com/memory/showdoc.aspx?i=2145&p=9

[Willemoes]

Yeah, that review was one of the reasons I went for the Ballistix.

Clevor tested the Pc4000 here.

http://www.abxzone.com/forums/archive/index.php/t-77822.html

My results so far:

memtest errorfree for 3 hours 2.5-3-3-6@248

Tried 2.5-3-2-6@248: No go (reboot in Win/prime)

2.5-3-3-5@248 gave me lower score in Sandra (buffered, didn´t check unbuffered; is the Memory bandwith in memtest86+ (3094) same as sandra unbuffered)?

2.5-3-3-6@250. No go (regardless of Cpu Vcore up to 1.6 (won´t go higher ´cause of temps)

At 248 the machine is memtest/Prime/3Dmark2001Se stable, so I guess I´ll settle for that for now.

Regards, finn