how to check sli??

[dirtybeatfreak]

hi i need to check if both my gfx cards r running but am not sure how? i have checked that SLI is running in nvidia control panel but when i open up DXDIAG it says only 768mb of video mem is available??? surely 2 x 768 would be 1536??? here is the snippet of the dxdiag..can some1 tell me if theres sommin wrong pls


---------------
Display Devices
---------------
Card name: NVIDIA GeForce 8800 GTX
Manufacturer: NVIDIA
Chip type: GeForce 8800 GTX
DAC type: Integrated RAMDAC
Device Key: Enum\PCI\VEN_10DE&DEV_0191&SUBSYS_039C10DE&REV_A2
Display Memory: 768.0 MB
Current Mode: 1680 x 1050 (32 bit) (60Hz)
Monitor: Default Monitor
Monitor Max Res:
Driver Name: nv4_disp.dll
Driver Version: 6.14.0011.5819 (English)
DDI Version: 9 (or higher)
Driver Attributes: Final Retail
Driver Date/Size: 4/12/2007 23:44:00, 5433216 bytes
WHQL Logo'd: No
WHQL Date Stamp: None
VDD: n/a
Mini VDD: nv4_mini.sys
Mini VDD Date: 4/12/2007 23:44:00, 6738656 bytes
Device Identifier: {D7B71E3E-42D1-11CF-D565-972303C2CB35}
Vendor ID: 0x10DE
Device ID: 0x0191
SubSys ID: 0x039C10DE
Revision ID: 0x00A2
Revision ID: 0x00A2
Video Accel: ModeMPEG2_A ModeMPEG2_B ModeMPEG2_C ModeMPEG2_D ModeWMV9_B ModeWMV9_A
Deinterlace Caps: {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
{6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(UYVY,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(UYVY,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
{6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(YV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(YV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
{6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
Registry: OK
DDraw Status: Enabled
D3D Status: Enabled
AGP Status: Enabled
DDraw Test Result: Not run
D3D7 Test Result: Not run
D3D8 Test Result: Not run
D3D9 Test Result: Not run

 

[melbourne720]

Run 3d mark 06 before and after

 

[Will_3rd]

In SLI only one of the video card's memory is used.

 

[sidefxv1]

I thought SLI didn't "double up" your video RAM like that. I forget exactly why, but it just doesn't work like that.

EDIT: oops, beaten too it. I thought that it used both the VRAMs concurrently though? Rather than ignoring one completely.

 

[waylander07]

for the sli to function both cards keep the same info in video ram, so yu'll only ever see half the total ie one cards worth.

the benefit comes from the increase in processing power, not more ram.

 

[dirtybeatfreak]

ahhhhhh, thx guys still gettin a decent score in 3dmark so its all good