A few questions on the FX-8120.

MentalIlness

Platinum Member
Nov 22, 2009
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I have been looking for a review that tested it, but I am having no luck.

But....would disabling "4c/2m" and run a 8120 as a quad permit more performance than say running all "8c/4m ?

I can run at 4.6 Ghz with "8c/4m". Would the overclock go any higher possibly with half of them disabled ? With them all enabled, I have not tried to go higher though.

Edit: Not that I need more performance at 1080p. Just interested in how far I can take it. Can hit a hair over 4.2 on stock voltage.

Note: Leave the AMD-FX bashing at the door. No need for it here.
 
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MentalIlness

Platinum Member
Nov 22, 2009
2,383
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I remember reading a review around the launch of these cpu's that actually tested this. But ill be dang if I can find it now.
 

MentalIlness

Platinum Member
Nov 22, 2009
2,383
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Well, I found this. But isnt the one I read in the past.

table2.png
 

MentalIlness

Platinum Member
Nov 22, 2009
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That's to do with spreading out a workload by dedicating its threads to separate modules.

You'll likely OC a bit higher by turning off 2 modules but why are you looking to try this?

Probably curiosity more than anything. Also...wonder what disabling one module would do for overclocking ?

Would disabling one module and gaining 5% be fair ? Two modules for around 10% ? Or does it even work that way ? Not in performance gains though, I am speaking of oc'ing frequency gains.
 

pelov

Diamond Member
Dec 6, 2011
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There's no set number, but generally speaking the lower the core count the lower the power required/heat when under load so you'll have more headroom.

For example, with 2 cores disabled on my 955 I can get over 4ghz pretty easily but with all 4 I can't get over 4 unless I apply a massive amount of voltage, the ceiling being ~3.8ghz.
 

AtenRa

Lifer
Feb 2, 2009
14,000
3,357
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I have been looking for a review that tested it, but I am having no luck.

But....would disabling "4c/2m" and run a 8120 as a quad permit more performance than say running all "8c/4m ?

I can run at 4.6 Ghz with "8c/4m". Would the overclock go any higher possibly with half of them disabled ? With them all enabled, I have not tried to go higher though.

Edit: Not that I need more performance at 1080p. Just interested in how far I can take it. Can hit a hair over 4.2 on stock voltage.

Note: Leave the AMD-FX bashing at the door. No need for it here.

4 threads with 4 modules will get you more performance than 4 threads out of two modules.

For overclocking just remember, not every module is the same. OC one module at a time to find out what module is the best Overclocker. ;)

You may also find my review of BDs CMT scaling useful.
http://atenra.blog.com/2012/02/01/amd’s-bulldozer-cmt-scaling/
 

AtenRa

Lifer
Feb 2, 2009
14,000
3,357
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Those are all 8 thread optimized bench marks ... http://www.phoronix.com/scan.php?page=article&item=amd_bulldozer_scaling&num=7.

Per core less traffic is better using four threads or less, which is the case for majority of typical users no? Do you have any gaming benchmarks using 4c/4t vs. 4c/8t config ?

No point using a 4 threaded application with an 8 threaded CPU to evaluate if 8 threads are better than 4.
As for games, no i havent tried this but it will be useless with 8 threads. Better try 2 Modules 2 threads vs 2 modules 4 threads. Im sure the latter will be better.
 

MentalIlness

Platinum Member
Nov 22, 2009
2,383
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What kind of physics score does an 8 core bd pull at 4.6ghz.

I have only made it up to 4.2. I havnt went up any further yet, ran out of time. But I will here soon. But it seems I have a bottleneck in my GPU. Am I right ? Since the graphics score seems not to raise whatsoever.

Could the GPU have any affect on the Physics score ?

8120 @ Stock

Score
P4558
Graphics
4582
Physics
4766
Combined
4130

8120 @ 3.6

Score
P4639
Graphics
4594
Physics
5240
Combined
4224

8120 @ 4.0

Score
P4704
Graphics
4597
Physics
5818
Combined
4235

8120 @ 4.2

Score
P4716
Graphics
4597
Physics
5943
Combined
4230
 
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