Current Prime95 (Anyone use?)

gruntled

I use Prime95 (current) over 24hr to stress test.

I have checked 'Round off Checking' in Prime but my system crashs instead of reporting errors, anyone else have this problem?

If I raise vcores and make it stable for acouple of hours it still doesn't report errors but crashes after 4+hrs of stressing.

I have tried all the testing profiles (small ffts and all that) still the same. Could it be memory instability or whatnot?

Thanks.

Knight_Breed

I have been using Prime95 along with OCCT and a few other programs for stress and temperature testing. I haven't had crashing issues with Prime95 but have had a few errors reported when O/Cing a bit to high.

To me it sounds like a memory issue because when memory locks up so does the OS and Prime95 ... so it can't report the error.

What OS are you running and what are your detailed system specs and RAM timings, voltages, etc?

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gruntled

They are (I will be sure to update profile with this information later).

OS Windows Vista Ultimate 64bit SP1

Dimm 2x2gb ddr2 800 kingston (transcend pqi? Whatever that means)
Running at 422ghz 1:1 ratio
Vram set at 1.8 (6-6-6-18)


NBcore set at 1.12
(I did a bad thing and upped it to 1.23 but was unstable so I put it back down while also lowering VTT from 1.2 to 1.1 and it became more stable, stable for 10mins in prime95 but crashed in under 2 mins on prime95 with higher VTT/NBcore) And it's bad because now I don't know why it lasted a teeny weeny bit longer.

e8600 VID 1.2500 (I think it sucks that vid is that high)
@4.2ghz with vcore set at 1.4v (way to high for a e8600 for 4.22ghz)
sbcore @1.1v (default)
nbcore 1.12v
PLL 1.55v (default is 1.5v)

Knight_Breed

OK on the RAM seems Kingston is calling everything Valueram these days including a 2x2G set worth 300 bucks

Can you identify your RAM by Kingston part number for us?
Kingston Technology Company - Kingston Memory Search - Search Results for : DDR2 PC2 6400

I am seeing timings like 5-5-5-15 @ 1.8V for most. Noted your running 422Mhz(not Ghz) which translates to 844Mhz for your PC-6400 RAM. Depending on the grade of RAM that should not be an issue.

On A Gigabyte board (as you have) I have found changing NB and SB as well as Vcore impact little O/Cing with C2D's. As I mentioned in another thread your PCI-E overvoltage is what allows stability of your O/C and should be maxed (If you set Auto for voltage that is the key element that is changed). In fact I have seen Wolfdale's O/Ced over 3.5G with Vcore undervolted.

Anyway get back to us on the exact model of RAM you are using and we can go from there

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gruntled

I read your message about the PCI-e overvoltage on the other thread your helping out with and got the impression it was dangerous to up it too much because that is where the graphics card resides (don't want to burn my 4870x2).

So does the auto setting up the pci-e overvoltage alot in Gigabyte motherboards?
I have my pci-e frequency set to 100mhz, but I haven't seen a pci-e overvoltage option. (are they the same thing?)

I will check the ram code (think I'll have to open the case up and see if the sticker is still on the ram or is there a different way to check with a program in windows? CPU-Z only gives the serial and whatnot).

Also, isn't a higher cpu termination voltage dangerous? I thought it should be under the vcore in terms of volts. I have it set to 1.1v lol. (tired higher, like 1.3v with vcore at 1.28 and witnessed no change)

gruntled

Exact model is KVR800D2N6/2G

Any idea on what settings it should be on for 4.22ghz?

I think it doesn't need to be tweaked for 4ghz because it's running on it's recommened spec of 800 but I have no idea what clock cycles it needs for 844 (extra .044).

Knight_Breed

OK did some checking around and looks like 6-6-6-18 is standard for that RAM. It is a cheaper RAM so it won't O/C much not sure if 844 is a bit much for it or not.

A couple of things I can suggest is use your memory ratios to get a bit closer to 800Mhz or if you want to keep that speed loosen off your RFC.

Standard PC-6400 is 5-5-5-15 (CL-RCD-RP-RAS) / 24-45-3-6-3-3 (RC-RFC-RRD-WR-WTR-RTP)

I run my RFC@54 and it can be loosened off to 60. I have seen it done on my OCZ and Corsair Dominator but not sure how it will work with your RAM.

Hope this helps

EDIT:

Sorry missed this PCI-E frequency and PCI-E overvoltage are not the same thing always leave frequency at 100 or Auto. The voltage setting in my BIOS is right under DDR overvoltage you may not have it.

If you set auto voltage on my board it sets PCI-E overvoltage to +0.35V and my Vcore to 1.42. I can set the PCI-E voltage manually and run everthing else unchanged O/Cing .

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gruntled

Wow thanks! You've been a great help Knight_Breed.

Yeah, I think I might have to stick to 4ghz.

I will test some things out and come back if I make any breakthroughs.

I should've gotten better ram but the only good available ones for overclocking at the shop I was looking at had corsair twin3x dd33 at $599 for 2gb stick lol.

Knight_Breed

You are most welcome gruntled and if I can be of more help post back

I think you will need to upgrade your RAM this 2x2G of OCZ ReaperX PC-8000 cost me about 150CAD. I was thinking you just needed to change a memory divider but perhaps you don't have one low enough @ your O/C. Nice CPU BTW with the x10 multiplier and our CPU's do share one thing ... a rated FSB of 1333Mhz.

That is the reason I went with PC-8000 and you might even consider PC-8500. Even @ 7x440 I can still drop my RAM back to 800Mhz if I need too. It may be because PC-8000 is recognized by Gigabyte as PC-6400 allowing me that headroom or my motherboard has more options .. not completely sure.

Anyway best of luck and Cheers Bro

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gruntled

Well I made a breakthrough, seems the ram worked (I currently have the tRFC-60). Have the ram running at 1.9v and overclocked alittle at 840 and the mch at 1.22v.

CPU is at 10x420 and was prime stable for 25hrs.

I don't like the temperatures (vcore 1.36875V BIOS/ VTT 1.3v) though because it reaches 63C max and 33C idle and if my ambient temperature increases slightly it might cause it to go over the 65C threashold of what I'm willing to let it go. (On the upside it is summer in Australia of current testing and when winter comes along it'll be 10C lower)

I might change ram later to see if I can't get a better lowered vcore.

Also am going to experiment to see if I can't get any of the values lower and prime stable for 24hrs.

That's the update

Knight_Breed

Cool glad your making headway and I thought that loosening off the RFC(tRFC) timing would help stabilize your RAM a bit.

On the temps I prefer around 50C or under loaded what are you using for a CPU cooler? And also what are you using to read temps?

Your processor uses EO stepping mine uses GO both have a Tjunction(core) rating of 100C. Some programs and motherboard BIOS's are still set up for the older C2D Tjunction of 85C so if thats the case and your reading temps from BIOS they could possibly be 15C higher than they actually are. I use HWmonitor and Everest for temps here both show the temps of both cores as opposed to Tcase.

Here's some more info on your CPU ...
Intel® Core?2 Duo Desktop Processor E8600 - SLB9L

Hope things stay stable for ya

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gruntled

I use both RealTemp and CoreTemp both at Tj100C.

Coolerwise I use a Zalman9700led that is runing on maximum rotation all the time (2500rpm).

Have you ever used any of them Knight_Breed?

I once set my vcore to 0.9v for 3.33 and still recorded a idle temp. of 33C.

Could it be the cpu temp. monitor having abit of a missy fit? Or maybe it's my cpu minimum temperature?

As for maximum temp. the sky's the limit. Though I don't let it go over 66C in RealTemp for long.

And Happy New Year!

Knight_Breed

I haven't used them myself Bro but have read a few reviews and they seem solid. Temps under high fan just over 50C loaded in most of them. Just out of curiosity what are you getting at your stock clock and stock voltage?

Humour me and run this program with the one hour setting and see what the results are OCCT

I think those temps are too high I am going to raise my Vcore to 1.45V myself and see what I get here.


Cheers and Happy New Year to you as well

EDIT: This is Vcore@1.45V with an approx O/C of 30 percent ...

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