Intel Core i5-661: A 32nm CPU with Integrated Graphics

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IGP Test Results

To evaluate the performance of Intel GMA HD graphics, we setup the i5-661 in our standard motherboard test platform featuring a notebook hard drive, Blu-ray drive, and Seasonic power supply. Our test results for Intel's previous flagship IGP, GMA X4500HD were obtained using a 2.53GHz Core 2 Duo E7200. To make it a more fair battle, we tested the i5-661 underclocked to 2.26GHz by lowering the CPU's multiplier to 17x in addition to stock speed.

Video Playback
Test State
Core i5-661 @ 3.33GHz
(Stock)
Core i5-661 @ 2.26GHz
(Underclocked)
Avg.
CPU
System Power (DC)
Avg.
CPU
System Power (DC)
Rush Hour
(H.264)
3%
31W
17%
31W
Coral Reef
(WMV-HD)
8%
31W
10%
31W
Drag Race
(VC-1)
13%
35W
16%
34W
Disturbia
(Blu-ray H.264)
28%
43W
39%
40W
Becoming Jane
(Blu-ray VC-1)
13%
39W
16%
38W
TurboBoost disabled during video playback testing.

Like most modern IGPs, Intel's GMA HD had no problem rendering our video test suite with low CPU utilization playing both H.264 and VC-1 content with the CPU at stock speeds. Even underclocked by almost a third, playback was smooth, though H.264 playback was more reliant on CPU resources than we usually see when using Nvidia or ATI graphics. Power consumption was very low during playback.

Video Playback: GMA X4500HD vs. GMA HD
Test State
E7200 @ 2.53GHz (Intel DG45FC)
Core i5-661 @ 2.26GHz (Intel DH55TC)
Avg.
CPU
System Power (DC)
Avg.
CPU
System Power (DC)
Rush Hour
(H.264)
30%
29W
17%
31W
Coral Reef
(WMV-HD)
25%
30W
10%
31W
Drag Race
(VC-1)
40%
33W
16%
34W

Despite a 266MHz disadvantage in processor clock speed, the i5-661's GMA HD required significantly less CPU assistance to play HD video compared to the GMA X4500HD paired with a Core 2 Duo E7200. Either the IGP is more efficient or the i5 processor is much faster clock for clock (or a combination of the two). Power consumption was similar on both platforms.

3D Performance: Futuremark Comparison
Motherboard
Graphics
3DMark05
3DMark06
Asus P5Q-EM
(C2D E7200)
X4500HD
1708
1092
MSI KA760GM
(X2 4850e)
HD 3000
2289
1049
Gigabyte MA78GM-2SH
(X2 4850e)
HD 3200
2293
1116
Intel DH55TC
(Core i5-661 @ 2.26GHz)
GMA HD
3179
1676
Intel DH55TC
(Core i5-661)
GMA HD
3215
1688
Zotac GeForce 9300-ITX (C2D E7200)
GF9300
3522
1797
Asus M4A785TD-V
(X3 720 BE)
HD 4200 (Sideport)
4095
1789
Asus M4A78T-E
(X3 720 BE)
HD 3300 (Sideport)
4884
2205
System configuration: 2GB of RAM, 256MB of VRAM assigned (128MB for motherboards with 128MB of Sideport memory).

GMA HD is also a faster IGP in 3D performance, with a hefty improvement onver X4500HD in both 3DMark05 and 3DMark06. Its scores put it close to the GeForce 9300, but still aways off from the Sideport equipped HD 4200/3300 for AM3. For older games at lower resolutions, it should be sufficient. Note that the i5-661's GPU has a 900MHz clock speed while the other Clarkdales have to suffice with 733MHz.



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