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AMD Athlon II X4 645 3.1GHz Socket AM3 Quad-Core Processor Review
AMD Athlon II X4 645 3.1GHz Socket AM3 Quad-Core Processor Review
Abstract: In this review PCSTATS is testing AMD's latest mainstream quad-core chip, the 3.1GHz Athlon II X4 645 processor. Architecturally speaking the Athlon II X4 645 is identical to the preceding Athlon II X4 635 model, except for a modest clock speed increase.

 Manufacturer  Category  Published  Author 
AMD   CPU / Processors   Sep 22, 2010   A. Edmond  
Home > Reviews > Page Title: AMD Athlon II X4 645 CPU Overclocking Report

Overclocking Results:
Stock Max. OC
Processor Speed: 3.1 GHz

3.81 GHz

Multiplier / Bus Speed: 15.5x 200MHz

15.5x 245MHz

If you're new to Overclocking and not sure what to do, check out these two excellent Guides for some pointers:
Overclocking the CPU and Memory
Overclocking the Videocard

AMD's mainstream quad-core 3.1GHz Athlon II X4 645 processor retails for $122 so it's a pretty good value out of the gate. However, given that Athlon II processors lack L3 cache, a bit of overclocking can do wonders to make things seem a little faster still.

Before PCSTATS begins its overclocking adventures, the test system memory is first configured from DDR3-1066 to run in DDR3-800 MHz mode so it wouldn't hold the CPU back. The Athlon II X4 645 processor is multiplier locked, so we'll be overclocking it by increasing the bus speed alone. PCSTATS has seen mixed overclocking results from the mainstream Athlon II chips but we're still going to aim for the magic 4 GHz!

With the Athlon II X4 645 locked and loaded into an ASUS Crosshair IV Formula motherboard, we set about overclocking the bus speed from the its default 200MHz. The first few increments up to 235MHz came and went without any trouble. We pressed on with a 245MHz bus and then 250MHz..... but the system failed to boot into Windows 7.

In the end PCSTATS settled for a maximum bus speed overclock of 245MHz, resulting in a modest overclock to 3.81GHz for the little quad-core Athlon II X4 645 processor. Not bad at all, but not qute 4GHz either.

Prelude to Benchmarks

Over the following page PCSTATS will be running AMD's 3.1GHz quad-core AMD Athlon II X4 645 processor though our standard set of gaming, productivity, and multi-threaded processor benchmarks. There are a wide variety of real world and synthetic benchmarks to illustrate the different performance qualities users can expect from this quad-core socket AM3 AMD processor. Please take a moment to look over PCSTATS test system configurations before moving on to the individual benchmark results on the next several pages.

PCSTATS Test System Configurations
Test System Reference System #1 Reference System #2 Reference System #3
Processor: AMD Phenom II X4 1090T
AMD Phenom II X4 1075T
AMD Phenom II X4 970 BE
AMD Phenom II X4 965 BE
AMD Phenom II X4 910e
AMD Phenom II X2 555 BE
AMD Athlon II X4 645
AMD Athlon II X4 635
AMD Athlon II X4 620
AMD Athlon II X3 435
AMD Athlon II X2 240e

Intel Core i5 750

Intel Core i7 920 Intel Core 2 Duo E8400
CPU Process Technology: 45nm 45nm 45nm 45nm
Socket: Socket AM3 Socket LGA1156 Socket LGA1366 Socket LGA775
Clock Speed:

16x 200MHz = 3.2GHz (1090T)
15x 200MHz = 3.0GHz (1070T)
17.5x 200MHz = 3.5GHz (970 BE)
17x 200MHz = 3.4GHz (965 BE)
13x 200MHz = 2.6GHz (910e)
16.0x 200MHz = 3.2GHz (555BE)
15.5x 200MHz = 2.9GHz (AIIX4 645)
14.5x 200MHz = 2.9GHz (AIIX4 635)
13x 200MHz = 2.6GHz (AIIX4 620)
14.5x 200MHz = 2.9GHz (AIIX3 435)
14x 200 MHz = 2.8GHz (AIIX2 240e)< STRONG >

20x 133MHz = 2.66GHz 20x 133MHz = 2.67GHz 9x 333MHz = 3.0GHz (E8500)
Motherboard: Gigabyte GA-MA790FXT-UD5P (AMD 790FX)
MSI 890FXA-GD70 (AMD 890FX)
ASUS Crosshair IV Formula (890FX)
Gigabyte GA-P55-UD6 (Intel P55)
MSI X58 Platinum (X58 Express)

MSI X48 Platinum (X48 Express)

Videocard: ASUS ENGTS250 DK
(Geforce GTS250)
(Geforce GTS250)
(Geforce GTS 250)
(Geforce 8800GTS)

2x2GB Corsair XMS3-1600C8 DDR3

2x2GB Corsair XMS3-1600C8 DDR3 3x2GB Corsair TR3X6G1600C8D DDR3

2x1GB Patriot PDC32G1600LLK DDR3

Hard Drive:

74GB Western Digital Raptor WD740

Optical Drive:


Power Supply:

PC Power & Cooling TurboCool 750W


Athlon64 K8 Reference Heatsink

Intel Reference 1156 Heatsink Intel Reference 1366 Heatsink Intel Reference 775 Heatsink
Software Setup:

Microsoft Windows 7 Ultimate
AMD Catalyst 10.3
nVIDIA Forceware 195.62

Microsoft Windows 7 Ultimate
nVIDIA Forceware 195.62

Microsoft Windows 7 Ultimate
Intel INF
nVIDIA Forceware 195.62

Microsoft Windows 7 Ultimate
Intel INF
nVIDIA Forceware 195.62

System Benchmarks:
SYSmark 2007
PCMark Vantage
SiSoft Sandra 2009

Calculation B/M:
Super Pi 1.5
wPrime 2.0
ScienceMark 2.3
WinRAR 3.8
Bibble 5

Rendering B/M:
Cinebench R10
POV-Ray 3.7
SPECviewPerf 10

Gaming B/M:
3DMark Vantage

 Previous Page °
° Next Page 

Table of Contents:

 1:  AMD Athlon II X4 645 3.1GHz Socket AM3 Quad-Core Processor Review
 2: — AMD Athlon II X4 645 CPU Overclocking Report
 3:  CPU System Benchmarks: Sysmark 2007
 4:  CPU System Benchmarks: PCMark Vantage
 5:  CPU Synthetic Benchmarks: SiSoft Sandra Processor
 6:  CPU Synthetic Benchmarks: SiSoft Sandra Memory
 7:  CPU Calculation Benchmarks: Super Pi
 8:  CPU Calculation Benchmarks: wPrime2.0
 9:  CPU Calculation Benchmarks: ScienceMark2.3, WinRAR
 10:  CPU Rendering Benchmarks: Cinebench R10, Bibble 5
 11:  CPU Rendering Benchmarks: POV-Ray 3.7
 12:  CPU Rendering Benchmarks: SPECviewPerf 10
 13:  CPU Synthetic Gaming Benchmarks: 3DMark Vantage, 3DMark 06
 14:  CPU Gaming Benchmarks: Crysis, FEAR
 15:  Incremental Clock Boost, Minor Gain?

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