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Test notes
We underclocked a Core 2 Extreme QX9650 in order to simulate our Core 2 Quad Q9450, but performance should be exactly the same. Power consumption should be a different matter, so we left the Q9450 out of those tests. We used the same method to simulate a Core 2 Duo E8400 with an underclocked E8500 and a Phenom X3 8450 with an underclocked 8750.

Our testing methods
As ever, we did our best to deliver clean benchmark numbers. Tests were run at least three times, and the results were averaged.

Our test systems were configured like so:

Processor Core 2 Quad Q6600 2.4GHz Core 2 Duo E6750 2.66GHz
Core 2 Extreme QX6850 3.00GHz
Core 2 Extreme QX9770 3.2GHz Dual Core 2 Extreme QX9775 3.2GHz Athlon 64 X2 5600+ 2.8GHz
Athlon 64 X2 6000+ 3.0GHz
Athlon 64 X2 6400+ 3.2GHz
Phenom 9500 2.2GHz
Phenom 9600 2.3GHz
Core 2 Extreme QX9650 3.00GHz Phenom X3 8450 2.1GHz
Phenom X3 8750
2.4GHz
Phenom X4 9750
2.4GHz
Phenom X4 9850
Black Edition
2.5GHz
Core 2 Duo E7200 2.53GHz
Core 2 Duo E8400 3.0GHz
Core 2 Duo E8500 3.16GHz
Core 2 Quad Q9300 2.5GHz
Core 2 Quad Q9450 2.66GHz
System bus 1066MHz (266MHz quad-pumped) 1333MHz (333MHz quad-pumped) 1600MHz (400MHz quad-pumped) 1600MHz (400MHz quad-pumped) 1GHz HyperTransport 1GHz HyperTransport
Motherboard Gigabyte GA-P35T-DQ6 Gigabyte GA-P35T-DQ6 Gigabyte GA-X38-DQ6 Intel D5400XS Asus M2N32-SLI Deluxe MSI K9A2 Platinum
BIOS revision F1 F1 F6b XS54010J.86A.0780.
2008.0110.1956
1201 VP.0B7 (No patch)
V1.2B1 (TLB patch)
F4 V1.3
F5c
F5c
North bridge P35 Express MCH P35 Express MCH X38 Express MCH 5400 MCH nForce 590 SLI SPP 790FX
South bridge ICH9R ICH9R ICH9R 6321ESB ICH nForce 590 SLI MCP SB600
Chipset drivers INF Update 8.3.0.1013
Intel Matrix Storage Manager 7.5
INF Update 8.3.0.1013
Intel Matrix Storage Manager 7.5
INF Update 8.3.0.1013
Intel Matrix Storage Manager 7.5
INF Update 8.5.0.1009
Intel Matrix Storage Manager 7.8
ForceWare 15.01 -
Memory size 4GB (4 DIMMs) 4GB (4 DIMMs) 4GB (4 DIMMs) 4GB (2 DIMMs) 4GB (4 DIMMs) 4GB (4 DIMMs)
Memory type Corsair TWIN3X2048-1333C9DHX
DDR3 SDRAM
at 1066MHz
Corsair TWIN3X2048-1333C9DHX
DDR3 SDRAM
at 1333MHz
Corsair TWIN2X2048-8500C5D
DDR2 SDRAM
at 800MHz
Micron ECC DDR2-800 FB-DIMM at 800MHz Corsair TWIN2X2048-8500
DDR2 SDRAM
at ~800MHz
Corsair TWIN2X2048-8500C5D
DDR2 SDRAM
at 800MHz
CAS latency (CL) 8 8 4 5 4 4
RAS to CAS delay (tRCD) 8 9 4 5 4 4
RAS precharge (tRP) 8 9 4 5 4 4
Cycle time (tRAS) 20 24 18 18 18 18
Audio Integrated ICH9R/ALC889A
with Realtek 6.0.1.5449 drivers
Integrated ICH9R/ALC889A
with Realtek 6.0.1.5449 drivers
Integrated ICH9R/ALC889A
with Realtek 6.0.1.5449 drivers
Integrated 6321ESB/STAC9274D5
with SigmaTel 6.10.5511.0 drivers
Integrated nForce 590 MCP/AD1988B
with Soundmax 6.10.2.6100 drivers
Integrated SB600/ALC888
with Realtek 6.0.1.5532 drivers
Hard drive WD Caviar SE16 320GB SATA
Graphics GeForce 8800 GTX 768MB PCIe with ForceWare 163.11 and 163.71 drivers
OS Windows Vista Ultimate x64 Edition
OS updates KB940105, KB929777 (nForce/790FX systems only), KB938194, KB938979

Please note that testing was conducted in two stages. Non-gaming apps and Supreme Commander were tested with Vista patches KB940105 and KB929777 (nForce/790FX systems only) and ForceWare 163.11 drivers. The other games were tested with the additional Vista patches KB938194 and KB938979 and ForceWare 163.71 drivers.

Thanks to Corsair for providing us with memory for our testing. Their products and support are far and away superior to generic, no-name memory.

Our single-socket test systems were powered by OCZ GameXStream 700W power supply units. The dual-socket systems were powered by PC Power & Cooling Turbo-Cool 1KW-SR power supplies. Thanks to OCZ for providing these units for our use in testing.

Also, the folks at NCIXUS.com hooked us up with a nice deal on the WD Caviar SE16 drives used in our test rigs. NCIX now sells to U.S. customers, so check them out.

The test systems' Windows desktops were set at 1280x1024 in 32-bit color at an 85Hz screen refresh rate. Vertical refresh sync (vsync) was disabled.

We used the following versions of our test applications:

The tests and methods we employ are usually publicly available and reproducible. If you have questions about our methods, hit our forums to talk with us about them.