This is my current set-up and I'd recommend it to anyone... I can run every game on high to ultra settings (Fallout, Crysis, Battlefield, CoD, CS:S, TF2, you name it). If you are shopping for a new CPU look no further than the AMD 955 or 965.
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System Information
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Operating System: Windows 7 Enterprise 64-bit (6.1, Build 7600) (7600.win7_rtm.090713-1255)
Language: English (Regional Setting: English)
System Manufacturer: Gigabyte Technology Co., Ltd.
System Model: GA-MA790XT-UD4P
BIOS: Award Modular BIOS v6.00PG
Processor: AMD Phenom(tm) II X4 955 Processor (4 CPUs), ~3.2GHz
Memory: 4096MB RAM
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Display Devices
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Card name: ATI Radeon HD 4800 Series
Manufacturer: ATI Technologies Inc.
Chip type: ATI display adapter (0x9460)
DAC type: Internal DAC(400MHz)
Device Key: Enum\PCI\VEN_1002&DEV_9460&SUBSYS_22821787&REV_00
Display Memory: 2425 MB
Dedicated Memory: 1017 MB
Shared Memory: 1407 MB
Current Mode: 1920 x 1080 (32 bit) (59Hz)
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DirectInput Devices
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Device Name: Logitech G5 Gaming Mouse
Attached: 1
Controller ID: 0x0
Vendor/Product ID: 0x046D, 0xC049
FF Driver: n/a
Device Name: Saitek Eclipse II Keyboard
Attached: 1
Controller ID: 0x0
Vendor/Product ID: 0x06A3, 0x8021
FF Driver: n/a
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Disk & DVD/CD-ROM Drives
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Drive: C:
Free Space: 24.6 GB
Total Space: 49.9 GB
File System: NTFS
Model: SATA WDC WD6401AALS-0 SCSI Disk Device
Drive: D:
Free Space: 359.7 GB
Total Space: 560.5 GB
File System: NTFS
Model: SATA WDC WD6401AALS-0 SCSI Disk Device