Core i5 2500k - Poor CPU results?

[fbc]

*** Problem resolved it seems - upgraded to Win 7 64bit and results now better ***

Hi everyone,

Just built an i5 2500k system and some of the CPU results are way down on other 2500k systems.

My results:
CPU - Integer Math: 614.6
CPU - Floating Point Math: 2365.3
CPU - Find Prime Numbers: 1237.3
CPU - Multimedia Instructions: 24.1
CPU - Compression: 8023.0
CPU - Encryption: 20.2
CPU - Physics: 354.8
CPU - String Sorting: 4541.8

The Integer Maths results is really low, the others are closer to other systems but still some way off. My immediate thought is that the RAM and / or O/S are the cause - I'm only running 4Gb and XP SP3 32bit at the moment, my intention was to see how this performed and then go to 8Gb / Win 7 if need be.

System spec is:
CPU Type: Intel Core i5-2500K @ 3.30GHz
CPU Speed: 3292.2 MHz
Cache size: 256KB
O/S: Windows XP (32-bit)
Total RAM: 2985.2 MB.
Available RAM: 2186.6 MB.

The full results are:
CPU - Integer Math: 614.6
CPU - Floating Point Math: 2365.3
CPU - Find Prime Numbers: 1237.3
CPU - Multimedia Instructions: 24.1
CPU - Compression: 8023.0
CPU - Encryption: 20.2
CPU - Physics: 354.8
CPU - String Sorting: 4541.8
Graphics 2D - Solid Vectors: 11.6
Graphics 2D - Transparent Vectors: 3.0
Graphics 2D - Complex Vectors: 156.8
Graphics 2D - Fonts and Text: 150.6
Graphics 2D - Windows Interface: 153.9
Graphics 2D - Image Filters: 588.6
Graphics 2D - Image Rendering: 419.5
Graphics 3D - Simple: 527.3
Graphics 3D - Medium: 204.5
Graphics 3D - Complex: 38.3
Memory - Allocate Small Block: 5370.1
Memory - Read Cached: 2879.2
Memory - Read Uncached: 2737.7
Memory - Write: 2400.9
Memory - Large RAM: 1922.4
Disk - Sequential Read: 124.1
Disk - Sequential Write: 111.4
Disk - Random Seek + RW: 3.5
CPU Mark: 5237.8
2D Graphics Mark: 727.9
Memory Mark: 1297.5
Disk Mark: 864.6
3D Graphics Mark: 469.3
PassMark Rating: 1803.9

Any thoughts / suggestions would be greatly appreciated.

Cheers

[David (PassMark)]

Yes, the Integer Maths test is very sensitive to 32/64bit. (Probably slightly too much in fact). There is some background information on 64bit performance here if you are interested.