D820 2.80 GHz faster than Core2Duo U7700 1.33

December 27, 2009 at 18:19:14
Specs: Windows XP
I've read that the Core2Duo is a complete redesign of the CPU when
compared with the Pentium D. I expected that a slower clocked
Core2Duo would be quicker than a Pentium D with a higher clock speed.

I have been comparing these two systems:

Pentium D820 2.80GHz, 1GB DDR2 533 MHz (desktop)
Core2Duo U7700 1.33GHz, 2GB DDR2 667 MHz (laptop)

I've used Everest and PC Wizard to benchmark these systems and the
Pentium D system outperforms the Core2Duo system in every area.

I'm most surprised that the D820 scores better in CPU and RAM
benchmarks. Is this to be expected for any reason? Any explanations
would be appreciated.

I'm running XP on the D820 and have tried benchmarking the U7700 with
both XP and Windows 7.


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December 27, 2009 at 19:47:31
You're comparing a laptop to a desktop. I'm sure the motherboard chipsets are different, plus the FSB speeds are different (800MHz vs 533MHz), not to mention there's a huge difference in clock speeds. You have to be realistic when doing your comparisons.

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December 27, 2009 at 21:20:30
Thanks, that clears quite a bit up.

Would the U7700 realize any performance difference at all with
533 MHz RAM instead of the 667 MHz?

For some reason I had thought that the slowest Core2Duo could
outperform the fastest D or 4 chip.

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December 28, 2009 at 00:00:35
The desktop has a faster front side bus. Faster FSB=greater bandwidth between CPU and memory=higher score on memory test.

Running a synthetic CPU test isn't the best way to determine actual CPU performance. I'm fairly certain that a 1.33GHz C2D would outperform a 2.8GHz P-D in most real-world applications.

Try encoding video with x264, Divx, or Windows Media Encoder. The C2D's extremely quick SIMD/FP unit should push it ahead of the P-D. The Core 2 also has a relatively short instruction execution pipeline, so content creation (Photoshop, Office, etc) and internet (IE, FF, Flash) performance should be right up there with the 2.8GHz Pentium D.

Socket 939|Dual-Core Opteron 185 @ 3.2GHz|A8N32-SLI Deluxe|4GB CL2 PC3200|SLI 8800GTS|1TB|PCIe X-Fi Titanium Pro|Win7 Ultimate x64

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