Increased temps on my i3 2120 using IGP

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Increased temps on my i3 2120 using IGP

Postposted on Tue Jul 16, 2013 6:35 pm

Ok since I am waiting for my TV to be repaired my substitute TV would not work with my HD7750 discrete video cards HDMI output I had to remove the card and use the IGP in my i3-2120.
My overall temps for core 0 and core 1 went up from 25-30c at idle to 35-37c at idle. Along with that 5-7c increase in temps, when i am watching a 1080p mkv core 1 goes up another 5-7c with the IGP running at 90% usage. with core 0 hitting 42-45c and core 1 hitting 47-50c. With my discrete card the same video would only make core 0 and core 1 hit 30-32c. The cooler i am using is like a intel boxed cooler but almost twice as tall and i have it running at a silent 2000rpms.
I am surprised the temps rose so much using Sandy bridges 6 rop HD graphics that according to GPUZ uses less then 6 watts. I imagine sandys HD3000 with 12 rops would increase temps even more..I have a i3-2125 in my other rig that I might remove the discrete card and see what temp increase i get with the HD 3000s 12 rop since it has the same cooler as my other rig I mentioned the temp increases on.
Ivys HD4000 has 16 rops and Haswell has 20 rops.

I imagine anyone using ivy bridge or haswell IGP along with a discrete card using vurtue MVP or something like that will get higher temps then if the IGP is disabled altogether. This could make a difference when overclocking the CPU cores on IVY and Haswel K models so I figured i would mention my observation and you can all do with it what you want. I found it very interesting.

http://www.xbitlabs.com/articles/cpu/di ... html#sect0 I found this xbit labs review showing the i3 2125 HD3000's using 55.3watts during GPU burn 10.3 watts more then the i3 2120 HD2000's 44 watt GPU burn Note that both CPUS are 3.3ghz with HT. The same chips with CPU+GPU burn has the 2120 at 68.9 watts to the 2125's 81.6 watts....12.7 watts more for 6 more rops and the same CPU cores.

Comments are welcome if any of you have notice this also.
Last edited by vargis14 on Tue Jul 16, 2013 6:54 pm, edited 1 time in total.
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Re: Increased temps on my i3 2120 using IGP

Postposted on Tue Jul 16, 2013 6:49 pm

The bit that you're overlooking is that the GPU may not be offloading as much of the processing as it was when you were using the discrete card, forcing the CPU to work harder.

It would be interesting to compare CPU load with and without the discrete GPU.
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Re: Increased temps on my i3 2120 using IGP

Postposted on Tue Jul 16, 2013 6:57 pm

I will run Intelburn now and let you know. I ran i recently with the discrete card in. I will know if it is much higher. Also I was watching CPU usage while watching the 1080p video and usage was very very low averaging 4-7% I think it was lower then with the discrete card. But the IGP was hovering at 90-92% usage and was maxed at 1150mhz with the memory a 667mhz since i have ddr3 1333 memory installed in dual channel mode. Once my TV is fixed on Sat I will do a before the discrete card and after.

Well I ran it andcore 0 was 5-7c hotter then normal and core 1 was 10-12c hotter hitting 62c...with the discrete card both cores ran the same at 50c Interesting:)

I use speedfan to control the CPU and chassis fan speeds, monitor temps and CPU usage.
2600k HT on@4705mhz 2x EVGA GTX770 4gb Classified cards running in SLI @1320 mhz core and 2003 mhz mem,mounted in CM HAF922.2xHTPC's 2xi3 2120 3.3ghz dual core,1xasus LP HD6570 1xHIS hd7750@1150core1325mem,55"PanyVT30
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Re: Increased temps on my i3 2120 using IGP

Postposted on Tue Jul 16, 2013 7:34 pm

Another possibility: Maybe taking the discrete GPU out has changed the airflow pattern in your case.
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Re: Increased temps on my i3 2120 using IGP

Postposted on Tue Jul 16, 2013 9:16 pm

JBI my CPU heatsink has a tube that extends it to the side panel. Plus if the video card does anything it would increase the case temp since it idles 35-40c and the heatsink does not exhaust any heat out from the case.

Plus the side panel is off at the moment :) So it should be cooler since my ceiling fan is on.
2600k HT on@4705mhz 2x EVGA GTX770 4gb Classified cards running in SLI @1320 mhz core and 2003 mhz mem,mounted in CM HAF922.2xHTPC's 2xi3 2120 3.3ghz dual core,1xasus LP HD6570 1xHIS hd7750@1150core1325mem,55"PanyVT30
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Re: Increased temps on my i3 2120 using IGP

Postposted on Wed Jul 17, 2013 11:30 am

Well I went and swapped my 3.3ghz i3 2120 6rop HD2000 CPU from the rig in this post to a 3.3ghz i3 2125 12rop HD3000 CPU from out of my other HTPC.

I cannot give you a accurate temperature reading comparison since I had to clean the dust that was caked on my heatsink. But i can say the 2125 CPU running at almost the same temps as the 2120 CPU with a clean heatsink, Idling at 33c and loaded it is running at around 55c. Also it seems according to GPUZ each sandy bridge GPU rop uses about 1 watt. Gpuz shows a full load on the gpu at 11.9watts withe the 12 rops, my 2120 with 6 rops was at 6.1 watts.

Now running a 1080p video instead of using 90%+ GPU usage it is well below 50% even dropping to 30%. Also core 1 now runs hotter then core 0 when the GPU is in use. I think that just might be from thermister calibration? "shrugs"
I am just happy It is performing better graphics wise.
2600k HT on@4705mhz 2x EVGA GTX770 4gb Classified cards running in SLI @1320 mhz core and 2003 mhz mem,mounted in CM HAF922.2xHTPC's 2xi3 2120 3.3ghz dual core,1xasus LP HD6570 1xHIS hd7750@1150core1325mem,55"PanyVT30
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Re: Increased temps on my i3 2120 using IGP

Postposted on Wed Jul 17, 2013 4:29 pm

Topic moved to OC/Cooling.
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