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New 6970m iMac Overclock... Questions!

post #1 of 17
Thread Starter 
Hey guys, new to the forum.
Has anyone had any experience OCing the new 27" iMac w/ Radeon 6970m? I've only been able to get it to 710/1000 via MSI afterburner as this seems to be the max allowed.
I've seen other sites recommending Sapphire Trixx, but was not sure if there was any more success than this. Any help would be appreciated.
iMac
(13 items)
 
  
CPUGraphicsRAMHard Drive
i7 3.4 GHz SB Radeon HD 6970m 8GB RAM 2TB 7200 rpm 
Monitor
27" LPS 
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iMac
(13 items)
 
  
CPUGraphicsRAMHard Drive
i7 3.4 GHz SB Radeon HD 6970m 8GB RAM 2TB 7200 rpm 
Monitor
27" LPS 
  hide details  
Reply
post #2 of 17
Welcome to OCN!

I would be careful overclocking an iMac due to the already minimal airflow. The heatsinks likely won't be able to handle any extra heat due to overclocking.

Have you been monitoring your temps under load?
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Gunmetal Tower
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Intel 2600K ASUS P8Z68-V GEN3 Asus GTX 580 CORSAIR Vengeance 16GB 1600 
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Microsoft Windows 8.1 Professional 64 Bit Asus PB278Q Dell 1907FPc  Ducky 9008-G2 Browns and Reds 
PowerCaseMouseMouse Pad
ABS SL1050 1050W Antec P280 Logitech G700 Mionix Propus 380 
AudioAudioAudioAudio
HT | OMEGA Claro Halo Audio Technica ATH-A900X Audio Technica ATH-AD900 M-Audio AV 40 
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post #3 of 17
If you wanted to overclock you should have gotten something else, the cooling is very limited.

My suggestion is, leave it where it is and keep an eye on your temps.
post #4 of 17
Macs aint overclock(er) friendly.
From FX to i7
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From FX to i7
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Samsung PM961 M.2 850 Evo LG Bluray Drive Phanteks PH-TC14PE 
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post #5 of 17
Thread Starter 
Yea, temps are low at these settings! Max temps I've seen: 69 degrees C. Often times they're in the mid 50s-low 60s even after running games for a >1 hr. Temps are much better in this year's model than mid-2010 (w/ 5850m). Unfortunately I need OSX for work.
iMac
(13 items)
 
  
CPUGraphicsRAMHard Drive
i7 3.4 GHz SB Radeon HD 6970m 8GB RAM 2TB 7200 rpm 
Monitor
27" LPS 
  hide details  
Reply
iMac
(13 items)
 
  
CPUGraphicsRAMHard Drive
i7 3.4 GHz SB Radeon HD 6970m 8GB RAM 2TB 7200 rpm 
Monitor
27" LPS 
  hide details  
Reply
post #6 of 17
Thread Starter 
I know they're not Overclocker-friendly to the extent a PC or tower is, but I had a fair bit of success OC'ing my mid-2010 one. I was able to get 15% gains in FPS at native res with afterburner and running the fans high.
iMac
(13 items)
 
  
CPUGraphicsRAMHard Drive
i7 3.4 GHz SB Radeon HD 6970m 8GB RAM 2TB 7200 rpm 
Monitor
27" LPS 
  hide details  
Reply
iMac
(13 items)
 
  
CPUGraphicsRAMHard Drive
i7 3.4 GHz SB Radeon HD 6970m 8GB RAM 2TB 7200 rpm 
Monitor
27" LPS 
  hide details  
Reply
post #7 of 17
Quote:
Originally Posted by swarleyb;13543584 
Yea, temps are low at these settings! Max temps I've seen: 69 degrees C. Often times they're in the mid 50s-low 60s even after running games for a >1 hr. Temps are much better in this year's model than mid-2010 (w/ 5850m). Unfortunately I need OSX for work.

get a macbook for work and then build a custom desktop.
post #8 of 17
Honestly I wouldn't worry about overclocking too much. The CPU and GPU are already very decent for most things, though I'm assuming you are just overclocking for the challenge and not because you really need the performance. Especially if it is for work, leaving it stock will save some headaches, crashes, and corruption that can come with overclocking. Those temperatures are already seeming about as high as I would feel comfortable with and I doubt you can really pump more voltage into them.
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Gunmetal Tower
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Intel 2600K ASUS P8Z68-V GEN3 Asus GTX 580 CORSAIR Vengeance 16GB 1600 
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Samsung 830 256GB Western Digital Caviar Black 640GB LG DVD Corsair H80 
OSMonitorMonitorKeyboard
Microsoft Windows 8.1 Professional 64 Bit Asus PB278Q Dell 1907FPc  Ducky 9008-G2 Browns and Reds 
PowerCaseMouseMouse Pad
ABS SL1050 1050W Antec P280 Logitech G700 Mionix Propus 380 
AudioAudioAudioAudio
HT | OMEGA Claro Halo Audio Technica ATH-A900X Audio Technica ATH-AD900 M-Audio AV 40 
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post #9 of 17
Thread Starter 
Quote:
Originally Posted by thrasherht;13543620 
get a macbook for work and then build a custom desktop.

I appreciate the thought, but the purchase has been made. A little costly to go back now.
iMac
(13 items)
 
  
CPUGraphicsRAMHard Drive
i7 3.4 GHz SB Radeon HD 6970m 8GB RAM 2TB 7200 rpm 
Monitor
27" LPS 
  hide details  
Reply
iMac
(13 items)
 
  
CPUGraphicsRAMHard Drive
i7 3.4 GHz SB Radeon HD 6970m 8GB RAM 2TB 7200 rpm 
Monitor
27" LPS 
  hide details  
Reply
post #10 of 17
Thread Starter 
Yea, I'm assuming voltage is the bottleneck. I just got witcher 2 and realized that the game is barely playable at med settings, with fps in the 20s-30s. I'm assuming this is an issue w/ optimization. But this has been the 1st game that does not play on at least native res w/o AA.
iMac
(13 items)
 
  
CPUGraphicsRAMHard Drive
i7 3.4 GHz SB Radeon HD 6970m 8GB RAM 2TB 7200 rpm 
Monitor
27" LPS 
  hide details  
Reply
iMac
(13 items)
 
  
CPUGraphicsRAMHard Drive
i7 3.4 GHz SB Radeon HD 6970m 8GB RAM 2TB 7200 rpm 
Monitor
27" LPS 
  hide details  
Reply
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