DDR2-800, Corsair, 4-4-4-12 @ 2.1v default -- how much faster?

[Thermodynamic]

System specs:
Gigabyte GA-P35-DS3L
Intel Q6600 (8x400MHz) 3.2GHz
8GB of RAM (two Corsair TWIN2x2GB 4GB sets, so all banks are filled.)
FSB:RAM ratio is 1:1
4-4-4-12 timings - rock solid

I had to add +.1v to (G)MCH to make it stable here.

Right now, I am testing 4-4-4-10 (2.1v, 800MHz) right now and I hope it's stable because post-login Vista took literally half the time it used to! )

4-4-4-8 WILL hang the system.

The BIOS read 1.945v for the RAM despite setting it in the BIOS to run at 2.1v. (+.3v manually added)

If I did +.4v, might 4-4-4-8 do any good? (Right now it can't get past the POST, and the BIOS paints .4v in pink and not flashing red )

What about 3-3-3-6 (won't even post)

There is one other value, tRFC, which is at 42. Dare I touch this number?

Any help would be most appreciated, thank you for reading!

 

[Evilsizer]

what modle ram? i know its PC6400 but is is the PC6400-C4's or soemthing else from corsair? i dought increasing voltage a small touch is going to get you 4-4-4-8 stable... have you run memtest86 to make sure its stable since it needs 2.1v for DDR2-800 4-4-4-12.

 

[Thermodynamic]

what modle ram? i know its PC6400 but is is the PC6400-C4's or soemthing else from corsair? i dought increasing voltage a small touch is going to get you 4-4-4-8 stable... have you run memtest86 to make sure its stable since it needs 2.1v for DDR2-800 4-4-4-12.

Thanks for the info (increasing voltage having minimal results)

Two kits of: Corsair TWIN2X4096-6400C4DHX - Retail. Totals 8GB (4 modules)

I know anything beyond 800MHz can make these modules touchy, and I'd rather stay at 800 anyway...

4-4-4-12 has been rock solid. (Memtest had reported 0 failures when I put everything together...)

4-4-4-10, under limited testing (45 minutes of heavy testing Prime95 while playing UT2004), has been solid - but visibly faster.

I am now trying 4-4-3-9 and, if things remain stable will do a full RAM test tomorrow to ensure everything down to the last bit. Seems a tad faster, at least with startup folder apps...

I'm happy with 4-4-4-10, but anything to raise the speed and bandwidth potential, I'll certainly try it within reason (e.g. I won't be pumping 2.5v into the RAM or 1.50v into the CPU any time soon... )