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NB needs voltage bump?

post #1 of 13
Thread Starter 
Ok, so I got these PC2-8000 (1000mhz) G.Skills in. They are rated for 5.5.5.15 @ 1000mhz 2.1v as printed on the package. These are the PQ series. They are VERY overclockable, people have gotten them to 1066+ at stock voltage. So here is my prob

I shove em in, system is stable at 667 (OC from 667 to 805 for my old ballistix) then I push it to 800 and set the voltage to 2.1, timings to 5.5.5.15. Reboot, system immediatly unstable. So I bump voltage to 2.175 and its kinda sorta stable, but windows bluescreens at me. So I am thinking maybe I need a NB voltage bump. If so, I was wondering what a standard NB rating is (voltage wise) and how much of a bump I should give it. My mb goes in pretty good increments I believe of 0.025v, dont know what the min setting is but the max is I think 1.5v.

So to sum it up

Bios set to DDR-800
Voltage at 2.175
Heat OK
Stable at ddr667 ONLY

MB in my sig. NF590 chipset.

Dont know if its important, but the ram doesnt really seem to be getting hot. Its actually MUCH cooler to the touch than my ballistix were, and at the same voltage.
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post #2 of 13
Don't forget to up the SB... I got errors with RAM on both the Crosshair and TA770 even though the RAM was @ near default speeds until I upped the SB a few notches.
    
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post #3 of 13
Thread Starter 
Thanks for the tip,

Any idea as to where I should start when upping the voltage? Like, more specifically, any idea what the 'current' voltage is as a starting point?
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post #4 of 13
You may need to loosen the TRFC a bit. Higher density memory needs a higher number on the tRFC than many boards default to.
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post #5 of 13
How are you getting it that fast? This is something I'm having trouble with. What are your multipliers/reference clock?
post #6 of 13
Thread Starter 
Quote:
Originally Posted by Blameless View Post
You may need to loosen the TRFC a bit. Higher density memory needs a higher number on the tRFC than many boards default to.
Everything is currently set to auto but what should I set it to? I havent played with trfc..

EDIT

Wow am I stupid. It shows I was tired when I was trying that lol. My ram set from 667 was running at 400.5 which means that its a 133mhz OC on the ram. Setting it to 800 made it boot up at 533 (1066 effective) which is why I had instability.

So I lower the reference clock from 267 to 247 and then bump my multiplier from 12 to 13 (to obtain the same CPU OC, and then set the ram to 800 and now the computer is useable. Fails orthos after just short of 2 min though, at around 900mhz @ 2.175v.
Edited by superk - 6/7/08 at 8:44am
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post #7 of 13
Thread Starter 
Ok so here is a quick update. After trying just about everything, I just set everything to auto and it works stable for usage. Orthos fails in ~2 min.

After spending all day batlling between this and some apparant gastro virus (stomach flu basically) I managed to get it working. I was wondering that since the memory controller is integrated onto the chip, if perhaps the cpu wasnt getting enough voltage now. Worked fine before, but now im OCing by quite a bit more.

I guess when I lowered the ref clock to 247mhz, the 'auto' voltage on the cpu didnt work very well, so it bumped the voltage back down to 1.35v stock. I raised it back up to 1.440v (set to 1.400 in bios) and now orthos has been running for ~20 minutes. Ram is currently OC @ 917mhz, 2.1v at 5.5.5.15 gonna try to lower that to like 4.4.3.10 if the ram will let me
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Apollo
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post #8 of 13
So your CPUZ says 458.5 MHz for DRAM Frequency?
post #9 of 13
Thread Starter 
458.7 actually

http://valid.x86-secret.com/show_oc.php?id=372561


UPDATE

After doing some more testing (not quite done yet) ive managed to get it to 464 using 1mhz increments and running orthos for 1 hour in between increments. I had to up the cpu voltage from 1.400 to 1.425. She runs a tad warm, even with my modest liquid setup, but I think I can squeeze a bit more before I hit the wall. CPU now runs at 3250 as opposed to 3210. Hoping the board will let me hit 3.3 but not sure about that.
Edited by superk - 6/8/08 at 9:24am
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Apollo
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post #10 of 13
Thread Starter 
Ok, so this is where I draw the line. 3.3ghz stable. If I had better cooling I am certain I could hit 3.5, but with my low-end liquid system, I am happy with my 3.3 stable but 3.4 benching OC.

3.3ghz from 2.8ghz, and DDR running at 473.6mhz (947 effective)

Orthos stable for 2 hours currently, going to let it run for the full 24 hour test. Temps not bad.

http://valid.x86-secret.com/show_oc.php?id=373087
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Apollo
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