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The Clarkdale Clockers Club - Page 9

post #81 of 111
I got my G6950/H55 rig all done. Both these clocks were done using the Intel HD Graphics at the stock setting of 533MHz (no discrete card was used). Below are my clocks:

Max Stable: 4515MHz 1.4v


Suicide: 4704MHz 1.4375v

Edited by Ben the OCer - 4/7/10 at 12:21pm
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post #82 of 111
very nice results there ben the OCer,great to see the G6950's rock&clock like hell too.
    
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post #83 of 111
Quote:
Originally Posted by radaja View Post
very nice results there ben the OCer,great to see the G6950's rock&clock like hell too.
Thanks, you were such a big help with everything! What is your highest stable clock? Was that 4.8GHz clock a suicide run or stable? By the way, in one of your screen shots you posted, the IGP voltage was 1v. Is that the stock setting because my G6950 stock IGP voltage is 1.262v. I know mine is a lower end model but that seems like quite the difference. My IGP is clocked 200MHz lower to boot (533MHz vs 733MHz).
Edited by Ben the OCer - 4/7/10 at 12:17pm
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post #84 of 111
May I join?
http://valid.canardpc.com/show_oc.php?id=1128093
I'm still testing for stability, but it seems rock solid at 1.32V so far.
post #85 of 111
Quote:
Originally Posted by Ben the OCer View Post
Thanks, you were such a big help with everything! What is your highest stable clock? Was that 4.8GHz clock a suicide run or stable? By the way, in one of your screen shots you posted, the IGP voltage was 1v. Is that the stock setting because my G6950 stock IGP voltage is 1.262v. I know mine is a lower end model but that seems like quite the difference. My IGP is clocked 200MHz lower to boot (533MHz vs 733MHz).
yea on that chip 4.94Ghz was as high as i got,but i sold it.i havbe a new one.
im not using the integrated graphics so now i set it to 0.20v,but stock is 1.0v
i wonder why the Q6950 has such high stock vcore?1.262v seems high compared to 1.0v
    
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post #86 of 111
Quote:
Originally Posted by radaja View Post
yea on that chip 4.94Ghz was as high as i got,but i sold it.i havbe a new one.
im not using the integrated graphics so now i set it to 0.20v,but stock is 1.0v
i wonder why the Q6950 has such high stock vcore?1.262v seems high compared to 1.0v
Wow, 4.94GHz was your highest stable clock? What voltage was that at? I'm confused by the voltage of the IGP too. I guess there's a good reason the G6950's IGP is clocked at 533MHz.
Edited by Ben the OCer - 4/11/10 at 4:49pm
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post #87 of 111
4.94Ghz needed 1.47v and was only superpi 1m stable.wouldnt even get through 32m.
the highest prime95 stable was 4.65Ghz.
heres my new kit of ram at 1600 and 1800 6-9-6-24



20x200@4000 ddr3-1600 6-9-6-24


22x180@3960 ddr3-1800 6-9-6-24


havent really tried pushing the cpu yet,and my new i7-920 and X58 board
gets here tomorrow so i'll be testing it out next,not sure when i'll get back
to the i3-530 or even if i do.all depends on how well my new setup OC's
    
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post #88 of 111
Hello all.
Long time reader, first time poster.

While looking for some info to help me along with stabilising my most recent project, I came across this excellent thread.
Here is my contribution to the clarkdale clocker's club.

I put a system together recently based on the idea of surrounding a cheap CPU with reasonable equipment, and overclocking the hell out of it for about 12 months until I could afford something with a few more cores.
Maybe some better video cards at the same time.
Perhaps I could even keep the 8800's in there for folding purposes...

CPU: Pentium G6950, costa rica
COOLER: Ptech Megahalems rev. b - 2x Comair Rotron MC12B3 'earbleeders'
MEMORY: 4x 1gb Kingston HyperX DDR3-2000
MAINBOARD: ASUSP7P55WS Supercomputer
VIDEO: 2x XFX 8800gt 512mb Alpha Dog (625/900)
PSU: Superflower 600w (more on this later)
HDD: 3x WD 640 Black in RAID5 w/ onboard controller

For testing, my weapons of choice are Orthos (Blend - stress test) combined with Furmark 1.8, set to max burn fullscreen 1280x1024 16xAA. The main reason I chose this resolution is that my test monitor can display it, and who would want to miss out on furmark's pretty screen!
As usual I aim for 1hour Orthos stable at a given test clock before proceeding higher, and 24 hours Orthos to claim a stable full-time overclock.
To stress the CPU and video heavily, I actually run Orthos + Furmark simultaneously.
A setting I tested at one point around the 4.6 area proved 15 hour orthos stable, but could only withstand 20 minutes of the 2 stress tests running together.
Extrapolating that on the basis of pure assumption (lol), if a system can withstand 4 hours of combined orthos+furmark, it should be able to withstand 24hour orthos testing. I do not rely on this rule, I continue the 24 hour orthos; but it has shown true thusfar.

A last note about my testing environment; I live in Australia, it's damned hot here and I don't have airconditioning in my office yet. As a result, ambient temps are generally in the area of 30c during the free time I have to devote to this stuff. Yes that's right, 30c. There's a lot of equipment in this room and it doesn't take much to reach that high when it's hardly ever
below 20 outside, even at night.

I've managed to get the system '24/7 stable' @ 4.62ghz, and along the way I discovered a few little things worth mentioning.
There was a 4.892 'suicide run' for anyone interested, IMO they're pretty meaningless so that's the only mention it will recieve.

Firstly, with all voltages and general tweaks set on either auto or the factory defaults in the BIOS, this chip managed 4.2 by modifying BCLK alone. Barely 10degrees above ambient under load, too.
At this point I was even substantially undervolting the memory, not realizing the BIOS detected it at 1.5v when they are 2.0v parts (woops).

A few steps further along, I had reached 4.4 by increasing the core voltage to 1.35 - requiring this level of voltage to sustain stability for longer than 1hr under load, and a full 1.4v to be 24hr stable.
Getting 4.5ghz required 1.475v at a minimum to be 1hr orthos stable, but would machine_exception bluescreen after 10hrs orthos unless the voltage was increased to 1.5v.

Getting above 4.5 proved to be... taxing.
One thing I can say with certainty is I experienced greater instability at any given clock using any of the possible clock skew settings.
The board's <auto> setting does a far finer job than blind stabbing, it would seem - in no case did clock skew adjustment provide greater stability for me, with this equipment.
An ocilloscope on-hand may make this a much more rewarding process!

To attain complete stability over 4.6ghz meant heavily overvolting pretty much everything. Even the PCH required more voltage to keep the system stable during the video stress tests.
I had already disabled spread spectrum (both CPU and PCI-E) from the moment I began to increase voltages.
This was the first point I needed to modify PLL voltage at all from the default to achieve stability, eventually requiring 2.0v.
Core and IMC (VTT) are both set at 1.55v in BIOS, although 1.50v is ~15hr orthos stable (machine exception bluescreen at 15:08).
Memory voltage I have left at the kingston specified 2.0v. I assumed it would not have any effect on stability to increase it, as the memory is already running well below spec.
Once I achieved stability @ 4.62, I tightened the memory timings to 5-5-5-21-48-1T and re-tested.

I'm not happy with the +12v Vdroop under load, among other things, so the PSU will be replaced by a TruePower 750 very shortly.
I don't believe (for a few reasons) that it is affecting my overclock... but it's not going to get any better as time goes on, that's for sure.

Unfortunately my decision to post here came after the end of my last 24hr run, so the provided screenshot is only 5 or so hours into orthos.
Furmark was running parallel to Orthos for the first 4 hours, which should be reflected in the current vs. max temps shown.

I will post the 24hour orthos when it finishes.
Ty for reading, and Ty all for this fantastic thread.
BOB
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BOB
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post #89 of 111
Don't trust software readings on voltages, get a multimeter to test for +12V lines. You should immediately back your RAM down to 1.65V. 1.8V will permanently damage your CPU.

Besides that, thanks for the information! I have been trying to get my CPU to boot at above 175MHz BCLK with no success.
post #90 of 111
Thanks for that, I hadn't thought to whip out the multimeter and will certainly be doing so
In any case, I have another system under far less stress that could stand to inherit that PSU, so i'll likely still be buying the Antec.

As for the ram voltage, honestly, it's 2.0v standard.
From kingston.com:
KHX2000C9D3K2/2GN 2GB 2000MHz DDR3 Non-ECC
CL9 (Kit of 2) NVIDIA SLI 9-9-9-27 2.0V

I have 2x of those kits, so I'm sure voltage is correct, but I will admit they're far below clock and could probably run at a reduced voltage, perhaps helping case temps a lil. Maybe they won't like the voltage reduction while they're forced to 5-5-5 (etc). Food for thought anyway.

Good luck with your overclock
BOB
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BOB
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