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Core i7 Memory Scaling: From DDR3-800 to DDR3-1600

Test Setup

HardwareDetails
System Hardware
CPU IntelIntel Core i7-975 Extreme (45 nm, 3.33 GHz, 4x 256 KB L2 and 8 MB L3 Cache, TDP 130 W, Rev. D0)
Motherboard (LGA 1366)Gigabyte EX58-UD4P (Rev. 1.0)
Chipset: Intel X58, ICH10R
, BIOS: F8 (05/11/2009)
RAM DDR33 x 2 GB DDR3-1600 (Corsair TR3X6G-1600C8D 8-8-8-24)
GraphicsZotac Geforce GTX 260²
GPU: Geforce GTX 260 (576 MHz), 
Graphics RAM: 896 MB DDR3 (1998 MHz), 
Stream Processors: 216, Shader Clock: 1242 MHz
Hard DriveWestern Digital VelociRaptor, 300 GB (WD3000HLFS)
10,000 RPM, SATA/300, 16 MB Cache
Blu-Ray DriveLG GGW-H20L, SATA/150
Power SupplyFortron Everest 1010, 1010 W
System Software and Drivers
Operating SystemWindows Vista Enterprise Version 6.0 x64 
Service Pack 2 (Build 6000)
Drivers and Settings
Nvidia GeForce DriversGeForce 185.85
Intel Chipset DriversChipset Installation Utility Ver. 9.1.0.1012
Intel Storage DriversMatrix Storage Drivers Ver. 8.8.0.1009

Graphics: Zotac Geforce GTX 260²

Hard Drive: Western Digital VelociRaptor

BenchmarkDetails
3D Games Benchmarks And Settings
Far Cry 2Version: 1.0.1
Far Cry 2 Benchmark Tool
Video Mode: 1280x800
Direct3D 9
Overall Quality: Medium
Bloom activated
HDR off
Demo: Ranch Small
GTA IVVersion: 1.0.3
Video Mode: 1280x1024
- 1280x1024
- Aspect Ratio: Auto
- All options: Medium
- View Distance: 30
- Detail Distance: 100
- Vehicle Density: 100
- Shadow Density: 16
- Definition: On
- Vsync: Off
Ingame Benchmark
Left 4 DeadVersion: 1.0.0.5
Video Mode: 1280x800
Game Settings
- Anti Aliasing none
- Filtering Trilinear
- Wait for vertical sync disabled
- Shader Detail Medium
- Effect Detail Medium
- Model/Texture Detail Medium
Demo: THG Demo 1
Audio Benchmarks And Settings
iTunesVersion: 8.1.0.52
Audio CD ("Terminator II" SE), 53 min.
Convert to AAC audio format
Lame Mp3Version 3.98
Audio CD "Terminator II SE", 53 min
convert wav to mp3 audio format
Command: -b 160 --nores (160 kbps)
Video Benchmarks And Settings
TMPEG 4.6Version: 4.6.3.268
Video: Terminator 2 SE DVD (720x576, 16:9) 5 Minutes
Audio: Dolby Digital, 48000 Hz, 6-Kanal, English
Advanced Acoustic Engine MP3 Encoder (160 kbps, 44.1 KHz)
DivX 6.8.5Version: 6.8.5
== Main Menu ==
default
== Codec Menu ==
Encoding mode: Insane Quality
Enhanced multithreading
Enabled using SSE4
Quarter-pixel search
== Video Menu ==
Quantization: MPEG-2
XviD 1.2.1Version: 1.2.1
Other Options / Encoder Menu -
Display encoding status = off
Mainconcept Reference 1.6.1Version: 1.6.1
MPEG2 to MPEG2 (H.264)
MainConcept H.264/AVC Codec
28 sec HDTV 1920x1080 (MPEG2)
Audio:
MPEG2 (44.1 kHz, 2 Channel, 16 Bit, 224 kbps)
Codec: H.264
Mode: PAL (25 FPS)
Profile: Settings for eight threads
Adobe Premiere Pro CS4Version: 4.0
WMV 1920x1080 (39 sec)
Export: Adobe Media Encoder
== Video ==
H.264 Blu-ray
1440x1080i 25 High Quality
Encoding Passes: one
Bitrate Mode: Vbr
Frame: 1440x1080
Frame Rate: 25
== Audio ==
PCM Audio, 48 kHz, Stereo
Encoding Passes: one
Application Benchmarks And Settings
Grisoft AVG Anti-Virus 8Version: 8.5.287
Virus base: 270.12.16/2094
Benchmark
Scan: compressed ZIP and RAR archives
Winrar 3.9Version 3.90 x64 BETA 1
Best compression
Benchmark: THG Workload
Winzip 12Version 12.0 (8252)
WinZIP command line Version 3
Compression = Best
Dictionary = 4096 KB
Benchmark: THG Workload
Autodesk 3D Studio Max 2009Version: 9.0, x64
Rendering Dragon Image
Resolution: 1920 x 1280 (frame 1-5)
Adobe Photoshop CS 4 (64-Bit)Version: 11
Filtering a 16 MB TIF (15000x7266)
Filters:
 Radial Blur (Amount: 10; Method: zoom; Quality: good)
, Shape Blur (Radius: 46 px; custom shape: Trademark symbol), 
Median (Radius: 1px)
, Polar Coordinates (Rectangular to Polar)
Adobe Acrobat 9 ProfessionalVersion: 9.0.0 (Extended)
== Printing Preferences Menu ==
Default Settings: Standard
== Adobe PDF Security - Edit Menu ==
Encrypt all documents (128 bit RC4)
Open Password: 123
Permissions Password: 321
Synthetic Benchmarks And Settings
3DMark VantageVersion: 1.02
, Options: Performance
, Graphics Test 1, 
Graphics Test 2
, CPU Test 1
, CPU Test 2
PCMark VantageVersion: 1.00
PCMark Benchmark
, Memories Benchmark
SiSoftware Sandra 2009Version: 2009 SP3
Processor Arithmetic, Cryptography, Memory Bandwidth