here is a good guide on how to oc that 680mx
http://forum.notebookreview.com/gam...guide-workaround-max-clocks-oc-stability.html
http://forum.notebookreview.com/gam...guide-workaround-max-clocks-oc-stability.html
here is a good guide on how to oc that 680mx
http://forum.notebookreview.com/gam...guide-workaround-max-clocks-oc-stability.html
I feel guilty entering the thread as a non-serious gamer. Do dabble on a bit of Civilization V but that's about it. Question I have is this, what sort of improvement does the 680MX have over the 675MX all else being equal?
I have to decide between i7/675MX or i5/680MX for my machine which is currently ordered for the former but the more I dig, the more I want to change the order to the latter
2012 iMac, 64-bit Geekbench 14155
http://browser.primatelabs.com/geekbench2/1398889
the 680m that you got is also without oc.Looking at 3DMark 11 results from the FutureMark website,
Radeon HD 6970 = 3174 score (2011 top iMac CTO)
GeForce GT 650M = 2185 score (2012 21" iMac and 15" Retina MBP)
GeForce GT 660M = 2394 score (2012 27" iMac 2.9GHz i5)
GeForce GTX 675M = 3337 score (not the 675MX in the 2012 27" iMac 3.1GHz Core i5 but . . .)
GeForce GTX 680M = 6437 score (not the CTO 680MX available in the top 27" iMac but definitely faster than all above)
GeForce GTX 680 (desktop model) = 10590 (and that's not even overclocked like the one we have one in our Mac Pro)
680MX is already the most powerful GPU with TDP of 122W. Do you really think, it needs any overclocking higher than standard +125(GPU)/+1000(vRAM) MSI Afterburner could offer?
the question is why not? there is a very large gap on what the 680mx can provide and a 680 can.
I don't think the issue is what the card is capable of, but what is thermally advisable in the iMac's form factor.
if this can happen on a m15x, I really think the thermal budget of the imac is going to be better
http://www.3dmark.com/3dm11/5170805
also, your computer wont come to harm, only if you raise the voltage, what will happen if you hit the thermal limit is the throttling of the 680mx
I had to reinstall BC and forgot the second time to change energy profiles. I will adjust that and run vantage and OpenGL bench as well.
The only drivers available from nvidia atm that even install were the current beta ones released on the 4th. They showed a 500 point increase over the default apple ones.
Ill have to look at gpu-z but from what was reported by the nvidia control panel it appeared that the core and memory aren't down clocked and are running at stock nv frequencies.
The fan did kick in after a while of running arkham city but 75% of the time the machine was completely silent.
The back was cool to the touch, unlike other iMacs in the past. My initial thoughts are the cooling design in these is tremendous, and a stable healthy oc might be very feasible.
Run the Heaven OpenGL Benchmark at 2560x1440 --defaults to that when you launch it on the 27" iMac. Use other default settings as well. Click "Run" and then "Benchmark" - the average FPS will be displayed in a pop-up window after it "flys" through 26 scenes:
http://unigine.com/products/heaven/download/
If you are running Windows, it tests Direct-X speed.
An OpenCL GPU test is LuxMark. (Runs on OS X and Windows.) You can render three different scenes with GPU only, CPU only, or combined CPU/GPU. Please post your results in Ksamples/sec for the Default Sala scene using GPU only:
http://www.luxrender.net/wiki/LuxMark#Download
Bonus: Geeks3D GPUtest - Runs under OS X as well as Windows. Has 3 OpenGL tests. Run FurMark and GiMark. Set at 2560x1440 and default settings. Click "Run benchmark" button and wait for the average to be posted in a pop-up window:
http://www.geeks3d.com/20121113/gpu...gl-benchmark-furmark-lands-on-linux-and-os-x/
Hi barefeets /bow Here are the results you requested run in Win7. All of these have been run after a clean restart and with energy profile on max performance. They are using the current beta drivers from the Nvidia website as the stock apple drivers were around 10% slower in all cases. I'll have to reboot in a bit and try the OS X versions that are available for the same benchmarks. I have yet to OC. Maybe later.
Heaven (Native resolution, default settings.)
FPS: 51.9
Scores: 1307
Min FPS: 28.6
Max FPS: 115.3
LuxMark (Sala default, GPU only)
Samples/sec 430K
Rays/sec 4155K on 488.5k tris
Geeks 3D GPUTest (native resolution, default options)
FurMark
Score: 1821 points (FPS: 30)
GiMark
Score: 3484 points (FPS: 58)
Hi barefeets /bow Here are the results you requested run in Win7.
Do you still have 3DMark installed? If so, maybe run once more with your energy profile set to High Performance?
The next thing is to upload gameplay videos to youtube
Heaven under OS X at 2560x1440,
Retina 15" MacBook Pro 2.7 w/ GT 650M = 17 FPS
2011 iMac 27" Core i7 3.4GHz w/ HD 6970 = 32 FPS
2010 Mac Pro 6-core w/ HD 5870 = 37 FPS
2010 Mac Pro 6-core w/ GTX 680 Classified = 57 FPS
Under Windows,
FENN's 2012 iMac 27" Core i7 3.4GHz w/ GTX 680MX = 52 FPS