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X6 1090T OC with SLI 460 GTX Question?

Last response: in Overclocking
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October 30, 2010 8:09:20 AM

Question?

Here are my overclock settings for this ASUS EVO board:

Processor Volts = 1.45
CPU BUS FREQ = 200
CPU Ratio = 20.0
DRAM = 1333

This gives my X6 1090T a 4ghz overclock and when I run 3dmark06 is scores 22,001. The problem is when I get to this stable overclock I begin to try to overclock my 460 GTXs in SLI which up to this point are at factory default settings. When I begin to overclock these cards my score in 3dmark begins to drop i.e. 21543. What could be causing this? Any help would be greatly appreciated.


Phenom II 1090T X6 BE
SLI 2 Each EVGA 460 GTX 768MB (Vanilla)
M4N98TD EVO
4GB GKILL RipJaws Series DDR3 1600 Model F3-12800CL9D-4GBRL
Zalman 9700 Cooler (Green LED)
OCZ MODXSTREAM-PRO 700W PS
WD 1TB 1001FALS 32MB Cache SATA
a b U Graphics card
a b K Overclocking
October 30, 2010 5:00:51 PM

Don't worry about 3DMark scores, run a game and let us know the difference in frame rates.
a b U Graphics card
a b K Overclocking
October 30, 2010 6:07:22 PM

How are you supplying power to your two 460's.
That psu has 1 6 pin and 1-6+2
Are you using molex connectors ?
I would put 1 pci-e power cable to each card and not both on one.
Putting only molex on a card is not a good idea.
What I'm getting at, is , a possible power issue ?
I would choose a game benchmark, for you o/c testing.
AvP dx11 benchmark is good, you start the shortcut and it runs and saves a txt file of your results. In document folder. Like this.

Quote:
AvP D3D11 Benchmark Report
==========================

**************************************************
* Report Created: 2010-10-04 @ 14:06:32
**************************************************
* Executable Build: V1.03, Apr 19 2010
**************************************************

*DX11 Hardware Detected*

Using Default Video Settings:

Resolution: 1920 x 1080
Texture Quality: 2
Shadow Quality: 3
Anisotropic Filtering: 16
SSAO: ON
Vertical Sync: OFF
DX11 Tessellation: ON
DX11 Advanced Shadows: ON
DX11 MSAA Samples: 1


Benchmark Summary:

Number of frames: 9465
Average Frame Time: 11.1ms
Average FPS: 90.3


Use command-line option '-logframetime' to report performance frame-by-frame.
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October 30, 2010 8:04:23 PM

Thanks for the quick reply! I will try both suggestions and let you know i.e. 1 Molex per card w/ pci-e power cable and a new benchmark platform. Thanks again.
a b U Graphics card
a c 291 K Overclocking
October 31, 2010 1:44:06 AM

Do u want better results?

1- Don't use only the CPU multiplier for OC the CPU, rise too the NB frequency to 2800MHz or 3000MHz (I recommend the last one)
2- Not all OC means better performance, u need find the correct settings combinations for get the better performance. Core clock and shader clock rise the performance in better way but u also need rise the Memory clock or the performance will not be the best rise all three in little steps and test the SLI with 3DMark 2001 SE is a little old but runs fine in Win 7 and only takes 10 minutes to finish the benchmark, if u get better score in every OC change to 3DMark 06 that is more heavy and takes more time to finish.
!