Intel’s Gen 6 Graphics

All 2nd generation Core series processors that fit into an LGA-1155 motherboard will have one of two GPUs integrated on-die: Intel’s HD Graphics 3000 or HD Graphics 2000. Intel’s upcoming Sandy Bridge E for LGA-2011 will not have an on-die GPU. All mobile 2nd generation Core series processors feature HD Graphics 3000.

The 3000 vs. 2000 comparison is pretty simple. The former has 12 cores or EUs as Intel likes to call them, while the latter only has 6. Clock speeds are the same although the higher end parts can turbo up to higher frequencies. Each EU is 128-bits wide, which makes a single EU sound a lot like a single Cayman SP.

Unlike Clarkdale, all versions of HD Graphics on Sandy Bridge support Turbo. Any TDP that is freed up by the CPU running at a lower frequency or having some of its cores shut off can be used by the GPU to turbo up. The default clock speed for both HD 2000 and 3000 on the desktop is 850MHz; however, the GPU can turbo up to 1100MHz in everything but the Core i7-2600/2600K. The top-end Sandy Bridge can run its GPU at up to 1350MHz.

Processor Intel HD Graphics EUs Quick Sync Graphics Clock Graphics Max Turbo
Intel Core i7-2600K 3000 12 Y 850MHz 1350MHz
Intel Core i7-2600 2000 6 Y 850MHz 1350MHz
Intel Core i5-2500K 3000 12 Y 850MHz 1100MHz
Intel Core i5-2500 2000 6 Y 850MHz 1100MHz
Intel Core i5-2400 2000 6 Y 850MHz 1100MHz
Intel Core i5-2300 2000 6 Y 850MHz 1100MHz
Intel Core i3-2120 2000 6 Y 850MHz 1100MHz
Intel Core i3-2100 2000 6 Y 850MHz 1100MHz
Intel Pentium G850 Intel HD Graphics 6 N 850MHz 1100MHz
Intel Pentium G840 Intel HD Graphics 6 N 850MHz 1100MHz
Intel Pentium G620 Intel HD Graphics 6 N 850MHz 1100MHz

Mobile is a bit different. The base GPU clock in all mobile SNB chips is 650MHz but the max turbo is higher at 1300MHz. The LV/ULV parts also have different max clocks, which we cover in the mobile article.

As I mentioned before, all mobile 2nd gen Core processors get the 12 EU version—Intel HD Graphics 3000. The desktop side is a bit more confusing. In desktop, the unlocked K-series SKUs get the 3000 GPU while everything else gets the 2000 GPU. That’s right: the SKUs most likely to be paired with discrete graphics are given the most powerful integrated graphics. Of course those users don’t pay any penalty for the beefier on-die GPU; when not in use the GPU is fully power gated.

Despite the odd perk for the K-series SKUs, Intel’s reasoning behind the GPU split does makes sense. The HD Graphics 2000 GPU is faster than any desktop integrated GPU on the market today, and it’s easy to add discrete graphics to a desktop system if the integrated GPU is insufficient. The 3000 is simply another feature to justify the small price adder for K-series buyers.

On the mobile side going entirely with 3000 is simply because of the quality of integrated or low-end graphics in mobile. You can’t easily add in a discrete card so Intel has to put its best foot forward to appease OEMs like Apple. I suspect the top-to-bottom use of HD Graphics 3000 in mobile is directly responsible for Apple using Sandy Bridge without a discrete GPU in its entry level notebooks in early 2011.

I’ve been careful to mention the use of HD Graphics 2000/3000 in 2nd generation Core series CPUs, as Intel will eventually bring Sandy Bridge down to the Pentium brand with the G800 and G600 series processors. These chips will feature a version of HD Graphics 2000 that Intel will simply call HD Graphics. Performance will be similar to the HD Graphics 2000 GPU, however it won’t feature Quick Sync.

Image Quality and Experience

Perhaps the best way to start this section is with a list. Between Jarred and I, these are the games we’ve tested with Intel’s on-die HD 3000 GPU:

Assassin’s Creed
Batman: Arkham Asylum
Borderlands
Battlefield: Bad Company 2
BioShock 2
Call of Duty: Black Ops
Call of Duty: Modern Warfare 2
Chronicles of Riddick: Dark Athena
Civilization V
Crysis: Warhead
Dawn of War II
DiRT 2
Dragon Age Origins
Elder Scrolls IV: Oblivion
Empire: Total War
Far Cry 2
Fallout 3
Fallout: New Vegas
FEAR 2: Project Origin
HAWX
HAWX 2
Left 4 Dead 2
Mafia II
Mass Effect 2
Metro 2033
STALKER: Call of Pripyat
Starcraft II
World of Warcraft

This is over two dozen titles, both old and new, that for the most part worked on Intel’s integrated graphics. Now for a GPU maker, this is nothing to be proud of, but given Intel’s track record with game compatibility this is a huge step forward.

We did of course run into some issues. Fallout 3 (but not New Vegas) requires a DLL hack to even run on Intel integrated graphics, and we saw some shadow rendering issues in Mafia II, but for the most part the titles—both old and new—worked.


Modern Warfare 2 in High Quality

Now the bad news. Despite huge performance gains and much improved compatibility, even the Intel HD Graphics 3000 requires that you run at fairly low detail settings to get playable frame rates in most of these games. There are a couple of exceptions but for the most part the rule of integrated graphics hasn’t changed: turn everything down before you start playing.


Modern Warfare 2 the way you have to run it on Intel HD Graphics 3000

This reality has been true for more than just Intel integrated graphics however. Even IGPs from AMD and NVIDIA had the same limitations, as well as the lowest end discrete cards on the market. The only advantage those solutions had over Intel in the past was performance.

Realistically we need at least another doubling of graphics performance before we can even begin to talk about playing games smoothly at higher quality settings. Interestingly enough, I’ve heard the performance of Intel’s HD Graphics 3000 is roughly equal to the GPU in the Xbox 360 at this point. It only took six years for Intel to get there. If Intel wants to contribute positively to PC gaming, we need to see continued doubling of processor graphics performance for at least the next couple generations. Unfortunately I’m worried that Ivy Bridge won’t bring another doubling as it only adds 4 EUs to the array.

Quick Sync: The Best Way to Transcode Intel HD Graphics 2000/3000 Performance
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  • dananski - Thursday, January 06, 2011 - link

    Games are usually limited in fps by the level of graphics, so processor speed doesn't make much of a difference unless you turn the graphics detail right down and use an overkill graphics card. As the point of this page was to review the CPU power, it's more representative to use low resolutions so that the CPU is the limiting factor.

    If you did this set of charts for gaming at 2560x1600 with full AA & max quality, all the processors would be stuck at about the same rate because the graphics card is the limiting factor.

    I expect Civ 5 would be an exception to this because it has really counter-intuitive performance.
    Reply
  • 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

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