Saturday, April 25th 2009

Athlon X2 7750 BE Unlocked to Quad-Core

by
btarunr
 Discuss (109 Comments)
Earlier this year, a Korean source had pointed out an easy method to enable a fourth core on the Phenom II X3. This was made possible by the way AMD has been designing its triple-core and dual-core processors based on the K10 "Stars" architecture: by disabling one or two cores on the quad-core die. "Sloppy" BIOS coding lead to the Phenom II X3 anomaly. It looks like a somewhat similar mod enables not one, but two cores on the sub-$100 Athlon X2 7750 Black Edition. A Korean technology website GiggleHD.com has reported a successful unlock of two cores.

The method is similar to that of the Phenom II X3 unlock: using flaws in BIOS code to enable cores, by enabling the "Advanced Clock Calibration" feature in the BIOS setup. The OS, Windows XP SP3, was able to see the processor as a "AMD Phenom(tm) FX-7750", while CPU-Z reads the name string correctly and lists the core count as 4. The motherboard in use is an ASRock A790GX/128M.
Source: Gigglehd.com

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109 Comments on Athlon X2 7750 BE Unlocked to Quad-Core

#101
BWG
Ok found 1.00 and installing. brb
Posted on Reply
#102
eidairaman1
The Exiled Airman
kenkickrI call BS on this. I get the same thing as you, ACC showing 4 cores but Win 7 still sees a dual core. I tried all bios 0502-0703 and same for each of these.

Are there any bios that are older than the one currently on your board?
So you know of anyone else getting the same thing or are they seeing 4 cores, because remember 7 is still in beta meaning the code could be partially disabled for debugging purposes, making sure the OS works on Dual cores first.
Posted on Reply
#103
BWG
Nothing. This is the original released bios. I have tried 1.00 and 1.20. I have not tried 1.10.

I am so novice at this but I tried ACC Auto, Per Core, and All Cores.

I am on Vista Ultimate 32 bit.
Posted on Reply
#104
kenkickr
eidairaman1So you know of anyone else getting the same thing or are they seeing 4 cores, because remember 7 is still in beta meaning the code could be partially disabled for debugging purposes, making sure the OS works on Dual cores first.
I tried in XP and Vista with the same results. Using Auto, All Cores, and Per Core(0,1,2,3); the bios during bootup shows 7750 Dual Core and All 3 OS's say 7750 Dual Core.
Posted on Reply
#105
BWG
I found another forum with folks who could and could not unlock X3's. It had something to do with the batch #'s. Blah Blah Blah w/e even if you unlock them i bet they run like crap and they are dissabled for a reason.

In other words I give up. But, if folks want me to try anything I will just drop a line.
Posted on Reply
#106
eidairaman1
The Exiled Airman
well i do know after awhile they will be disabling the 4th core even if its perfect to sell the X3 parts
Posted on Reply
#107
Wile E
Power User
eidairaman1well i do know after awhile they will be disabling the 4th core even if its perfect to sell the X3 parts
Yep, if X3 demand is higher than they churn out cpus with a single bad core, they'll just disable good ones.
Posted on Reply
#108
vagxtr
farlex85Quad for under $100, nice. When the 2 other cores are enabled, is their respective L3 cache enabled as well? Or do they use the cache for the other 2 cores?
Kumas already have all 2megs of L3 cache enabled. We can only enable cores with depending 512kB of L2 cache if we're lucky.

Is there any chance of Biostar boards having old BIOS revision repo that could be applied without running their proprietary exe from windows?
Posted on Reply
#109
p_o_s_pc
F@H&WCG addict
vagxtrKumas already have all 2megs of L3 cache enabled. We can only enable cores with depending 512kB of L2 cache if we're lucky.

Is there any chance of Biostar boards having old BIOS revision repo that could be applied without running their proprietary exe from windows?
look on there site they have a few BIOS available most of the time
Posted on Reply
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