I have no idea what the last two letters are on the top of the CPU. I'd have to pull the waterblock off to check.
If it's any help, the nvSystem Utility says the following:
Brand: AMD Athlon(tm) 64
Name: AMD (tm)
Family: 15
Model: 15
Stepping: 0
Here's the CPU-Z report about my CPU:
Number of CPUs 1
APIC ID 0
Name AMD Athlon 64 3800+
Code name NewCastle
Specification AMD Athlon(tm) 64 Processor 3800+
Family/Model/Stepping FF0
Extended Family/Model F/F
Brand ID 1
Package Socket 939
Core Stepping DH7-CG
Technology 0.13µ
Instructions Sets MMX, Extended MMX, 3DNow!, Extended 3DNow!, SSE, SSE2, x86-64
Clock Speed 2499.6 MHz
Clock multiplier x10.0
HTT Bus Frequency 250.0 MHz
L1 Data Cache 64 KBytes, 2-way set associative, 64 Bytes line size
L1 Instruction Cache 64 KBytes, 2-way set associative, 64 Bytes line size
L2 Cache 512 KBytes, 16-way set associative, 64 Bytes line size
L2 Speed 2499.6 MHz (Full)
L2 Location On Chip
L2 Data Prefetch Logic yes
L2 Bus Width 128 bits
It's *POSSIBLE* that my watercooling rig has something to do with it, but to be honest, I highly doubt it. When I get a chance, I'll take the waterblock off and read the markings on the CPU itself.
What happens when you just set the HT multiplier to 4x? Will the machine boot?