My old system was a AMD 6000+ x2 with 4 gigs Fatality ddr2-800 ram, and windows xp pro sp3. with a Asus 9800gt Ultimate running stock clocked, plus that card had all 128 stream processors enabled, I scored 11,156 3dmarks. the cpu was o/c to 3.3 from 3.0 stock. I installed another exact same card for sli and my scored climbed about 1300 3dmarks higher to almost 12,500 3dmarks.
i just installed a new Asrock k10n780sliX3-wifi board and a new AMD Phenom2 720 Blackedtion triple core with 4 gigs of OCZ gold ddr2 1066. I clocked the cpu to 3.6, with no voltage increase, no increase in FSB. I left it at 200MHZ. I ran 3dmark06 at default settings with only 1 Asus 9800gt Ulitmate in the system and scored 15077 3dmarks. i would seem that you may have a problem, not sure what but I think it should score better than that.
My results:
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Benchmark
Version 1.1.0
Width 1280
Height 1024
Anti-Aliasing None
Anti-Aliasing Quality 0
Texture Filtering Optimal
Anisotropic Level 1
VS Profile 3_0
PS Profile 3_0
Force full precision No
Disable HW shadow mapping No
Disable post-processing No
Force software vertex shader No
Color mipmaps No
Force software FP filtering No
Repeat tests Off
Fixed framerate Off
Comment
3DMark Score 15077 3DMarks
SM2.0 Score 7 K
HDR/SM3.0 Score 6 K
CPU Score 4245
Game Score N/A N/A
GT1 - Return To Proxycon 52.560 FPS
GT2 - Firefly Forest 57.201 FPS
CPU1 - Red Valley 1.374 FPS
CPU2 - Red Valley 2.098 FPS
HDR1 - Canyon Flight 62.653 FPS
HDR2 - Deep Freeze 66.193 FPS
Fill Rate - Single-Texturing 0.000 N/A N/A
Fill Rate - Multi-Texturing 0.000 N/A N/A
Pixel Shader 0.000 N/A N/A
Vertex Shader - Simple 0.000 N/A N/A
Vertex Shader - Complex 0.000 N/A N/A
Shader Particles (SM3.0) 0.000 N/A N/A
Perlin Noise (SM3.0) 0.000 N/A N/A
8 Triangles 0.000 N/A N/A
32 Triangles 0.000 N/A N/A
128 Triangles 0.000 N/A N/A
512 Triangles 0.000 N/A N/A
2048 Triangles 0.000 N/A N/A
32768 Triangles 0.000 N/A N/A
System Info
Version 3.12
CPU Info
Physical Processors 1
Logical Processors 3
Central Processing Units
Central Processing Unit
Manufacturer AMD
Family AMD Phenom(tm) II X3 720 Processor
Architecture 64-bit
Internal Clock 3600 MHz
Internal Clock Maximum 3600 MHz
External Clock 200 MHz
Socket Designation CPUSocket
Type
Upgrade Socket 940
MultiCore 3 Processor Cores
HyperThreadingTechnology N/A
Capabilities MMX, CMov, RDTSC, 3DNow!, Extended 3DNow!, SSE, SSE2, SSE3, PAE, NX
Version AMD Phenom(tm) II X3 720 Processor
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take care,
ICE