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Settings for OCZ Reaper HPC DDR3? CL5? - Page 2

post #11 of 17
isn't a random reboot with no bsod a cpu issue? generally lack of voltage?

btw, what memory divider r u running? I assume 5.33? (3:8)?
Edited by hesho - 10/13/10 at 7:33am
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post #12 of 17
Thread Starter 
Quote:
Originally Posted by hesho View Post
isn't a random reboot with no bsod a cpu issue? generally lack of voltage?

btw, what memory divider r u running? I assume 3.75? (3:8)?
It wasn't a reboot. The computer just turned off. I've stress tested my CPU speed/voltage a ton at this point and I fold 24/7 without problems. In fact, I can run almost up to 4.1GHz at 1.425V stably, but I wanted to be extra cautious since I'm folding.

I'm not sure of the ratio but I'm running 5.33 x 286 = 1524MHz.
post #13 of 17
Hey Klaxian, look at my setup for the full break down of what I am running (all memory timings.)

On the simple stuff, for the 1090T thuban (I am sure you are the same) you need a minimum of CPUNB 1.225v for at least an 8 hour stability with mem at 1600 MHz, thats directly from RyderOCZ and Tony from OCz Tech forums. The memory AT stock needs a minimum of 1.705v (1.71v is the closest option I have on my 790FXTA-UD5.)

My memory is indeed slower than yours, but the OCZ boys told me to whenever possible keep the timings the same using dual channel and 8GB without pushing Bank Cycle Time too low (tRP + Bank Cycle is a good estimate.) So you could try 6-6-6-20-1-26 @ 1600 which is benchmarkingly better than 5-7-5-20-1-(insert other memorytimings) - 27 @ 1540. I only use multiplier.

Keep your NB under 2800 MHz while tightening up your timings and take the CPU down to 3.6. Just my advice.

Its not that the quality is bad on these sticks, its that they are extremely picking with EVERY setting available, and mine are fully stable at 3.6 GHz, but 100% unstable with the same settings at 3.8 GHz. I find it hard to use 200 MHz off of HTT/FSB, and getting these stable. I am only able to be stable on Prime95 Blend for 8 hours and 11 minutes on my OC / timings / voltage, but its not any more stable on Jedec believe it or not. Does pass MemTest86+ 4.00 though, so its not really a huge deal to me. I am a gamer though with an occasional Einstein@Home or Seti@Home run, but not much anymore. Folding is very accuracy dependent I know.

Loose timings for me = unstable... go figure. I thought I was stuck with some bad ram, till someone suggested 7-7-7-20-1 for me... just tightened the other timings to get most performance while staying at 8+ hour blends.
Edited by RagingCain - 10/13/10 at 10:10am
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post #14 of 17
1.225V seems correct, I needed to up to that from 1.15V in order to attain full stability in IntelBurn at stock speeds & rated RAM settings; other tests have responded the same with full stability.
The memory voltage may vary, though nominally on AMD systems an increase in voltage may not needed for memory stability depending on your kit (unless you run a C2 processor in which case it may indeed be necessary) - upping the CPU-NB voltage and sometimes even the NB voltage usually takes care of that.
post #15 of 17
Quote:
Originally Posted by xd_1771 View Post
1.225V seems correct, I needed to up to that from 1.15V in order to attain full stability in IntelBurn at stock speeds & rated RAM settings; other tests have responded the same with full stability.
The memory voltage may vary, though nominally on AMD systems an increase in voltage may not needed for memory stability depending on your kit (unless you run a C2 processor in which case it may indeed be necessary) - upping the CPU-NB voltage and sometimes even the NB voltage usually takes care of that.
Be very wary with upping Mobo NB voltage. Do it as a last resort. My stock voltage on NB was 1.100, and 1.210 was enough to blow out the 4gb (2of4 x 2gb) RAM. However, it was RMA-ble because I was following OCz instruction to try and increment NB up to 1.275 and CPU-NB to 1.300.
Edited by RagingCain - 10/14/10 at 7:28am
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post #16 of 17
You upped it to 1.2 and it blew out your RAM? Strange considering this is the motherboard northbridge with no connection to your RAM whatsoever unless going through the CPU. Upping the voltage to 1.2 has been known to stabilize alot though - twice before it worked when I've recommended it.
post #17 of 17
Just a cautionary tale, to be honest I personally think my motherboard is slightly unstable to be honest and I am stuck with it for now.

However, I believe the Northbridge chipset interfaces with the physical DIMM but the memory freq / access cycles are controlled/regulated by the CPU's IMC.

Thats why bumping up the voltage on DDR3 and NB is sometimes recommended.

I think its a little fuzzy without official documentation, but I have heard of other people overvolting NB thinking its CPU NB to 1.50v and have had no permanent damage, hence I was probably just unlucky.

It also could of been the memory itself was just waiting to go bad as well, I wasn't worried about it once OCz techy said just RMA it.

I haven't touched the NB voltage since though ; )
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