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Discussion Starter · #1 ·
I will summarize testing in this first post, so keep checking it.

Out of the box, the cpu unlocked the 2 dormant cores. All 4 cores are stable. My cpu seems to be the cream of the X2 555 crop! Low voltage overclocks and the potential of my chip will be fully exposed!

Orginally, I had a Gigabyte GA-MA785GM-US2H Motherboard, but the power phase limited my overclocking. It was not terrible by any means, but as soon as I hit 1.45v, the overclocking became very unstable. I also was using a Scythe Mugen 2 Rev. B. This heatsink had a push/pull set of Scythe Slip-Stream SY1225SL-12SH 110 CFM fans. It did a wonderful job! I am keeping my results for the runs I made on air and cheap board to compare results.

I upgraded my motherboard to an Asus M489GTD Pro/USB3 with the 890GX/SB850 and 8+2 phase and added new Geil Ripjaws-X DDR3 1600 F3-12800CL7D-4GBXM memory. I also purchased an EK H30 Supreme LT 120 watercooling kit, a Koolance 240 Radiator, and a Swiftech MCW80 gpu waterblock.

My loop is PUMP/CPU/120RAD/GPU/240RAD/RES. It is not an awesome watercooling system, but it will help!

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First, testing with air and Gigabyte board:

Here is a shot of my aluminum heatsinks on the mosfets. I believe it did help and I also pushed a fan down on the heatsink to blow air over them. Thanks to a poster in the thread for that!



Here is a shot of my case on air. What cable management? You must be seeing things.



4/15/2011: I tested temp variance between core temps and cpu socket TMPIN1. Core was 6C cooler. Tested temps include this adjustment.

I did not exceed 1.488v in my testing due to poor phase.

X4: 1.275v 3.9GHz 39C Full Load 0,1,2,3 Prime95 2 hr Small FFT
X4: 1.350v 4.0GHz 39C Full Load 0,1,2,3 Prime95 1 hr Blend
X4: 1.375v 4.1GHz 40C Full Load 0,1,2,3 Prime95 1 hr Blend
X4: 1.425v 4.2GHz 43C Full Load 0,1,2,3 Prime95 1 hr Blend
X4: 1.488v 4.3GHz 47C Full Load 0,1,2,3 LinX

X3: 1.275v 3.9GHz 34C Full Load 0,1,2 1 hr blend
X3: 1.312v 4.0GHz 35C Full Load 0,1,2 1 hr blend
X3: 1.328v 4.1GHz 35C Full Load 0,1,2 1 hr blend
X3: 1.360v 4.2GHz 37C Full Load 0,1,2 1 hr blend
X3: 1.440v 4.3GHz 39C Full Load 0,1,2 1 hr blend
X3: 1.488v+ 4.4GHz 41C Full Load 0,1,2 BSOD at 50 mins code 124. Every v bump afterward BSOD within 5 minutes.

X2: 1.275v 4.1GHz 27C Full Load 0,1 1 hr Blend
X2: 1.312v 4.2GHz 28C Full Load 0,1 1 hr Blend
X2: 1.360v 4.3GHz 29C Full Load 0,1 1 hr Blend
X2: 1.392v 4.4GHz 30C Full Load 0,1 1 hr Blend
Could not get 4.5GHz stable <1.50v
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Second, testing with Asus board and liquid cooling:

Here are some pictures.




X4: 0.00v 3.9GHz 00C Full Load 0,1,2,3
X4: 0.00v 4.0GHz 00C Full Load 0,1,2,3
X4: 0.00v 4.1GHz 00C Full Load 0,1,2,3
X4: 0.00v 4.2GHz 00C Full Load 0,1,2,3
X4: 0.00v 4.3GHz 00C Full Load 0,1,2,3
X4: 1.51v 4.4GHz 48C Full Load 0,1,2,3 LinX/Folding 10 Days
X4: 0.00v 4.5GHz 00C Full Load 0,1,2,3 Not even going down this road!

X3: 0.00v 3.9GHz 00C Full Load 0,1,2
X3: 0.00v 4.0GHz 00C Full Load 0,1,2
X3: 0.00v 4.1GHz 00C Full Load 0,1,2
X3: 0.00v 4.2GHz 00C Full Load 0,1,2
X3: 0.00v 4.3GHz 00C Full Load 0,1,2
X3: 0.00v 4.4GHz 00C Full Load 0,1,2
X3: 0.00v 4.5GHz 00C Full Load 0,1,2

X2: 0.00v 4.1GHz 00C Full Load 0,1
X2: 0.00v 4.2GHz 00C Full Load 0,1
X2: 0.00v 4.3GHz 00C Full Load 0,1
X2: 0.00v 4.4GHz 00C Full Load 0,1
X2: 0.00v 4.5GHz 00C Full Load 0,1
 

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I only unlocked to tri-core, unfortunately de 3rd core doesn't even let me boot.. all of this on stock voltages (1.4v).. about oc'ing I'd say you better only unlock(if you can), don't try to overclock it higher, unless you wanna live dangerously, 4+1 phase and 125w TDP is not a good thing =)

I'm now running my x2 555be as x3 and 4ghz (1.418v) estable on prime, occt, linx and else, I could go further, but then I'd have to bump voltage to, like, 1.45v and I don't want it..

my mobo is the asus m4a88t-v evo (8+1 phase and 140w tdp)

good luck!
 

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Quote:


Originally Posted by BWG
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What wattage does it use while X3?

A 125 watt quad locked to a tri core at stock is 95 watts
 
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I don't know the wattage while x3.. hwmonitor shows 173.60w.. but then again I'm at 4ghz 1.418v... I guess the x3 wattage would be around 100w maximum
 

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It's a cheap 4+1 phase sharing a 2007-2008 design that Gigabyte used that is not only known for having trouble with high TDP and is also visibly very cheap. I say don't unlock it to 4 cores.
Don't trust those software wattage readings....exaggerated
 
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Discussion Starter · #7 ·
Ok, chip arrived today and I unlocked all 4 cores and booted into Windows. I wanted to at least test it with Prime95, but should I even do that on this board?

http://valid.canardpc.com/show_oc.php?id=1727802

Just to confirm, if I turn off a core and run as an X3, I should be safe to oc?
 

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It'd probably be fine at stock speed and stock cooler, but that is the extent of it. With a Scythe Mugen 2 you're already deviating from one of these, making your VRMs 10x more likely to fry because now they get absolutely no cooling.
As an x3 it would consume 95W (stock); keep it moderate and it should be fine
 
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I managed to get the card up to 4.5ghz as a dual config and up to 4.2ghz as a unlocked X4 but for right now i am running the chip as a X3 with 3.8ghz oc with stock volts (well actually a little under stock 1.34v to be exact stock is 1.38)
 

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Discussion Starter · #11 ·
That put's some other questions into perspective. X4 oc is worse than X2.

There must be a reason for the lack of equivelant boards to mine lol. I went ahead and ran some Prime95 tests at stock to see if I was stable. No errors yet and been running for 2 hours. I believe unlocking makes me loose the ability to see all 4 core temps right? My Easy Tune 6 says 41C at full load and 28C Idle. HWMonitor says the same.

Any way for me to get access to all 4 core temps? I tried several utilities with no success.

If I leave my voltage at stock on X4, can I oc without adding wattage?
 

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No, once you unlock any of the other cores you disable the temp sensors, I don't think that the quads are weaker in the OC over the stock 555 i think you just need more voltage to get a higher overclock.

My recommendation is to ditch prime95 and use LinX for stability testing...it brings up errors much faster.
 

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Discussion Starter · #13 ·
I went ahead and left it at X4 and started some testing. I am keeping it at stock voltage. I ran Prime95 and kept increasing the multi every 2 minutes. I BSOD'd at 4.0GHz. I backed it down to 3.9GHz and am 15 minutes into my Prime95 test.

This is pretty exciting to me. I think my chip is above average isn't it? Temp is 44 to 45 on Easy Tune. I could still use some help with core temps.

How accurate is a Zalman ZM-MFC2 Fan Controller when reading my PSU wattage? This device has a box I plug my power cord into. It has an extension to plug into my PSU and a USB that plugs into the controller. It says 206w.

ss39.png
 

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I never really heard of that zalman fan controller dono if they are accurate or not but, i would say it might be...because its a zalman a good brand. But yea you chip is definitly above average but i have seen one actually do 4ghz with 1.29v i dono if that was photoshopped or what but that must be a golden chip
 

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160W is the max TDP. TDP stands for thermal design power, or the amount of heat you are required to pull off it to keep it from overheating. So 160W is just the maximum amount of power the chip is designed to be expected to have pulled off it, that's not how much it is using. 4 core phenoms run at about 125W, +- depending on voltage/OC.

The reason X2s are X2s and not X4s is that they are binned as inferior X4s, hence they OC less well than their counterparts. This will of course vary considerably, with some X2s not even being able to unlock, to some unlocking to X4s that OC as well as any real X4. Luck of the draw for you.

P.S. impressive numbers you have there, < 1.3V going at 3.9GHz. Looks like you got one of the nicer ones.

EDIT: I Dunno what your HWMonitor read at 81C, but uh, watch out for whatever that is because that's way way too hot.
 

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I'm not surprised the MOSFETs (TMPIN2) load at 81C. They should be much lower than that for normal use. Like I said... overclocking 125W+ processor on cheap 4+1 phase... bad idea. Even without overvolt.
If you do decide to continue I would at least recommend you keep the temp down by adding some MOSFET heatsinks.... but I really don't recommend to OC on this board and high TDP Processors
 

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Discussion Starter · #20 ·
I am at 2 hours and I am going to go ahead and stop Prime95. I can at least have the comfort of knowing I have a good chip.

I will go ahead and X2 it next then X3. I will post where I get at those and find out what stock voltage does.

After I reset HW Monitor, that TMPIN2 did not go over 45. I wonder how long it was at 81 and if that was accurate.
 
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