SLI 670 FTW results, why are they low

[gumby6288]

ive been trying to OC my 670's and im not very happy with the results, default clock 1006MHz oc'd to 1095 MHz memory 1552MHz to 1577MHz,
Heaven Benchmark v3.0 Basic

FPS: 24.7
Scores: 621
Min FPS: 4.2
Max FPS: 69.6
Hardware

Binary: Windows 32bit Visual C++ 1600 Release Mar 7 2012
Operating system: Windows 7 (build 7601, Service Pack 1) 64bit
CPU model: Intel(R) Core(TM) i7-3820 CPU @ 3.60GHz
CPU flags: 3599MHz MMX SSE SSE2 SSE3 SSSE3 SSE41 SSE42 HTT
GPU model: NVIDIA GeForce GTX 670 9.18.13.479 2048Mb
Settings

Render: direct3d11
Mode: 4800x900 8xAA fullscreen
Shaders: high
Textures: high
Filter: trilinear
Anisotropy: 16x
Occlusion: enabled
Refraction: enabled
Volumetric: enabled
Tessellation: extreme

3x EVGA GTX670 FTW
Asus Rampage IV Extreme
Corsair Vengenge
Custom water loop
i7 3820

 

[inzone]

Are you using the Evga Precision X software to do the overclock?

 

[gumby6288]

yes sir i am

 

[inzone]

Did you link the cards so that all three have the same settings? Did you save the settings as a profile?

 

[gumby6288]

Did you link the cards so that all three have the same settings? Did you save the settings as a profile?

yes i have, and vsync is disabled

 

[inzone]

If you run the cards at stock are they working as they should? Are you getting high fps and in games are they also getting high fps.

 

[jacknhut]

Can you run 3dmark 11 and post a score? Not very familiar with heaven benchmark.

 

[gumby6288]

Can you run 3dmark 11 and post a score? Not very familiar with heaven benchmark.

http://www.3dmark.com/3dm11/4130347

 

[michaeljhuman]

I come close to that score with 2 cards (my cards overclocked to 1179 Mhz GPU, mem 1762 Mhz I think, Precision does not seem to report it correctly.)