Overclocking Intel's HD Graphics

The base clock of both Intel's HD Graphics 2000 and 3000 on desktop SKUs is 850MHz. Thankfully, Intel's 32nm process allows for much headroom in both the CPU and GPU for overclocking. There are no clock locks or K-series parts to worry about when it comes to GPU overclocking; everything is unlocked. I started by trying to see how far I could push the Core i3-2100's HD Graphics 2000.

While I could get into Windows and run games at up to 1.6GHz, I needed to back down to 1.4GHz to maintain stability across all of our tests. That's a 64.7% overclock:

In some cases (Civilization V, WoW, Dawn of War II), the overclocked HD Graphics 2000 was enough to bring the 6 EU part close to the performance of the 3000 model. For the most part however the overclock just helped the Core i3-2100 perform halfway between it and the Core i5-2500K.

I tried the same experiment with the Core i5-2500K. While there's no chance it could catch up to a Radeon HD 5570, I managed to overclock my 2500K to 1.55GHz (the GPU clock can be adjusted in 50MHz increments):

Intel HD Graphics 3000 Overclocking: 1550MHz

The 82.4% increase in clock speed resulted in anywhere from a 0.6% to 33.7% increase in performance. While that's not terrible, it's also not that great. It looks like we're fairly memory bandwidth constrained here.

Resolution Scaling with Intel HD Graphics 3000 The Test
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  • omelet - Tuesday, January 11, 2011 - link

    For almost any game, the resolution will not affect the stress on the CPU. It is no harder for a CPU to play the game at 2560x1600 than it is to play at 1024x768, so to ensure that the benchmark is CPU-limited, low resolutions are chosen.

    For instance, the i5 2500k gets ~65fps in the Starcraft test, which is run at 1024x768. The i5 2500k would also be capable of ~65fps at 2560x1600, but your graphics card might not be at that resolution.

    Since this is a review for a CPU, not for graphics cards, the lower resolution is used, so we know what the limitation is for just the CPU. If you want to know what resolution you can play at, look at graphics card reviews.
    Reply
  • Tom - Sunday, January 30, 2011 - link

    Which is why the tests have limited real world value. Skewing the tests to maximize the cpu differences makes new cpus look impressive, but it doesn't show the reality that the new cpu isn't needed in the real world for most games. Reply
  • Oyster - Monday, January 03, 2011 - link

    Maybe I missed this in the review, Anand, but can you please confirm that SB and SB-E will require quad-channel memory? Additionally, will it be possible to run dual-channel memory on these new motherboards? I guess I want to save money because I already have 8GB of dual-channel RAM :).

    Thanks for the great review!
    Reply
  • CharonPDX - Monday, January 03, 2011 - link

    You can confirm it from the photos of it only using two DIMMs in photo. Reply
  • JumpingJack - Monday, January 03, 2011 - link

    This has been discussed in great detail. The i7, i3, and i5 2XXX series is dual channel. The rumor mill is abound with SB-E having quad channel, but I don't recall seen anything official from Intel on this point. Reply
  • 8steve8 - Monday, January 03, 2011 - link

    the K processors have the much better IGP and a variable multiplier, but to use the improved IGP you need an H67 chipset, which doesn't support changing the multiplier? Reply
  • ViRGE - Monday, January 03, 2011 - link

    CPU Multiplier: Yes, H67 cannot change the CPU multiplier

    GPU Multiplier: No, even H67 can change the GPU multiplier
    Reply
  • mczak - Monday, January 03, 2011 - link

    I wonder why though? Is this just officially? I can't really see a good technical reason why CPU OC would work with P67 but not H67 - it is just turbo going up some more steps after all. Maybe board manufacturers can find a way around that?
    Or is this not really linked to the chipset but rather if the IGP is enabled (which after all also is linked to turbo)?
    Reply
  • Rick83 - Monday, January 03, 2011 - link

    I just checked the manual to MSI's 7676 Mainboard (high-end H67) and it lists cpu core multiplier in the bios (page 3-7 of the manual, only limitation mentioned is that of CPU support), with nothing grayed out and overclockability a feature. As this is the 1.1 Version, I think someone misunderstood something....

    Unless MSI has messed up its Manual after all and just reused the P67 Manual.... Still, the focus on over-clocking would be most ridiculous.
    Reply
  • Rick83 - Monday, January 03, 2011 - link

    also, there is this:http://www.eteknix.com/previews/foxconn-h67a-s-h67...

    Where the unlocked multiplier is specifically mentioned as a feature of the H67 board.
    So I think anandtech got it wrong here....
    Reply

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