Geforce GTX 260 OC too slow

hi,
i have Geforce GTX 260 OC (MSI T2D896) in my PC and i tested it with 3D Mark 06, the result was that I got only 10900 points.but with my old 8800 GTS 640 MB, I had 9800 points. Then I have the GPU-Z is started and found the data according to the Grakka with standard clock is running. I am only one PCI-E slot with 16 Lamb, and no PCI - E 2 slot? It's all I get is a PCI E connector 6, and with a 2x3 adapter on PCI E connector 6 pin to be connected. Have they brought in a strand?

Can anyone help!!!

The Geforce GTX 260 is with 896 MByte GDDR3 memory (448 bits), and supports DirectX 10th Standard clocks are: 576 MHz GPU, 1242 MHz shader and 1998 MHz memory, the test card is MSI with the overclocking to 620, 1296 and 2160 MHz high. With version 8.7, I had 3DMark06 for example, when a huge profit points can be reported (HD4870: 1100 plus points with the same configuration / without OC).

According Alternate:

Connection
PCIe 2.0 x16

Power Supply

Connector 2 x 6-pin
max. Consumption approximately 182 watts (at full load)

Graphics

Name NVIDIA GeForce GTX 260
Clock Speed 620 MHz
Stream Processors 216
Shader Clock 1296 MHz
Shader Model 4.0
Full Screen Anti Aliasing to 8 times
DirectX version 10
OpenGL version 2.1


http://gallery.techarena.in/data/513...ce_GTX_260.gif

Memory

Capacity 896 MB available
Type GDDR3
Frequency 2160 MHz
448 bit memory connection

THANK YOU for the help

MHz clock rates 2D Low Power 3D normal 3D OC (MSI) Geforce GTX 260 (896 MB) 300/600/100 400/800/300 576/1242/999 620/1296/1080.Everest knows the 55nm chips until the last 4 betas and the clock speeds of the cards are set in the BIOS and therefore have nothing to do with the driver.