It obviously isnt seeing that you have DDR 400 ram. at 1.2ghz and a 11.5 multi, that puts your RAM speed at 104mhz, which isnt right, it should be running at 200. I would check in your bios and see what it says the RAM is running at and i bet it isnt right, or it is running on a divider.
If you could post your full specs we might be able to help you more.
Number of processors 1
Number of cores 1 per processor
Number of threads 1 per processor
Name AMD Athlon XP
Code Name Barton
Specification AMD Athlon(tm) XP
Package Socket A (462)
Family/Model/Stepping 6.A.0
Extended Family/Model 7.A
Core Stepping
Technology 0.13 um
Core Speed 1150.1 MHz
Multiplier x Bus speed 11.5 x 100.0 MHz
Rated Bus speed 200.0 MHz
Instruction sets MMX (+), 3DNow! (+), SSE
L1 Data cache (per processor) 64 KBytes, 2-way set associative, 64-byte line size
L1 Instruction cache (per processor) 64 KBytes, 2-way set associative, 64-byte line size
L2 cache (per processor) 512 KBytes, 16-way set associative, 64-byte line size
Chipset & Memory
Northbridge NVIDIA nForce2 Ultra 400 rev. C1
Southbridge NVIDIA nForce2 MCP rev. A3
Graphic Interface AGP
AGP Revision 3.0
AGP Transfer Rate 8x
AGP Side Band Addressing supported, enabled
Memory Type DDR
Memory Size 1024 MBytes
Memory Frequency 166.7 MHz (3:5)
CAS# Latency (tCL) 2.5 clocks
RAS# to CAS# (tRCD) 3 clocks
RAS# Precharge (tRP) 3 clocks
Cycle Time (tRAS) 7 clocks
System
System Manufacturer
System Name K7NF2-RAID
System S/N 00000000
Mainboard Vendor
Mainboard Model K7NF2-RAID
BIOS Vendor American Megatrends Inc.
BIOS Version P1.30
BIOS Date 07/31/2006
Memory SPD
Module 1 DDR, PC3200 (200 MHz), 512 MBytes, Corsair
Module 2 DDR, PC3200 (200 MHz), 512 MBytes, Corsair
Software
Windows Version Microsoft Windows XP Professional Service Pack 2 (Build 2600)
DirectX Version 9.0c