The Sandy Bridge Review: Intel Core i7-2600K, i5-2500K and Core i3-2100 Tested
by Anand Lal Shimpi on January 3, 2011 12:01 AM ESTOverclocking 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):
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.
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dansus - Saturday, February 19, 2011 - link
Looking at the results of Quick Sync transcoding, the results are very interesting.But which h264 encoder is ArcSoft using, im guessing its Mainconcept, would like to compare QS with x264 to be sure of the results.
In future, be nice to see the original frame to compare with too. Without the original, comparing just the encoded frames means little.
7eventh - Sunday, February 20, 2011 - link
Looking at cbscores.com (using the actual Cinebench 11.5) the 2600K is not THAT glorious at rendring-speed ... Why did you use Cinebench 10?pshen7 - Tuesday, February 22, 2011 - link
Who in the world named it Sandy Bridge? And Cougar Point is no better. They need a better marketing department. Seriously.Peter Shen, Koowie.com
zzzxtreme - Thursday, March 3, 2011 - link
does that mean I can't install windows XP/DOS on UEFI motherboards?dwade123 - Tuesday, March 8, 2011 - link
Intel i3 2100 is so underrated. It beats AMD's fastest's 6 core and older i7 Quadcores in many games and is only a little slower in other areas.Wouggie - Tuesday, March 15, 2011 - link
With an even improved i7990 Extreme now out, with a base speed of 3.46 GHz, which would be the better choice, considering I am going to using a dedicated graphics card Nvidia Quadro 4000.Also. what do you see on the horizon for three channel motherboards with more than 2 SATA lll 6 Gb/s connectors?
georgevt - Sunday, March 27, 2011 - link
The benchmarks against the AMD processors are useless. All the compare is core-to-core performance (4 core to 4 core). You should be comparing is comparably priced processors/systems. For example, the 6-core AMD 1090T costs a hundred dollars less than the i7 2600 at newegg.com, yet your benchmarks fail to provide any comparative benchmarks. It's quite possible that for some applications, that the 6-core AMD may perform better than the more expensive i4-core 7 processors in your benchmarks.scurrier - Friday, April 1, 2011 - link
Anand says, "frequency domain (how often pixels of a certain color appear)," but this definition of the frequency domain is incorrect. Frequency domain in the case of video is a 2 dimensional discrete cosine transform of the frame. It is not a count of pixels like a histogram (binning) or anything.aka_Warlock - Saturday, April 30, 2011 - link
Would be nice to see som test of how much of a performance difference lacking VT-d has on th CPU?AbdurRauf - Monday, May 2, 2011 - link
Does the QuickSync handle uprezing or only transcoding? Have you looked at the new WinFast HPVC1111 SpursEnginex4 and compared it to Quicksync, Cuda and Stream encoding and uprezing?