hsth Posted June 30, 2011 Posted June 30, 2011 Hi, I've searched a lot of places but no answers (possibly the wrong places...). My setup: Windows 7 64bit Ultimate. Asus P6T Deluxe V2 motherboard. Intel Core i7 Extreme 965 @ 3.20GHz. 12 GB memory. 2 xGTX295 (first model with 2 PCB's). In Matt's signature I see also GTX295 but not sure what model and/or driver he uses. My problem: the answers from ED about strange effects in DCS all point to update to the latest NVidia divers. Fair enough. But... When I install up to and including version 197.45 I can disable/enable SLI in the control panel. And in the SLI performance option I can select: - use globals setting - single GPU - force alternate frame rendering 1 & 2 - 3-GPU alternate frame rendering & 2 - 4-GPU alternate frame rendering & 2. The alternate options always give strange video effects like blue shimmering. Globals settings (SLI enabled) or single GPU are fine. Now, for DCS A-10C I wanted to update the drivers to the latest version as recommended by ED. Version 257 - 266 all don't offer SLI enable/disable but SLI disable or use 3D viewer. With the 3D viewer selected it shows four GPU's connected. Version 270 - 275 report "SLI connection not found" at the time of installing the software! And again, it's disable or 3D viewer. In the selection box however the global setting is gone for all these latest versions. It's just single or the alternate settings to choose from. It took me some time installing, uninstalling, cleaning etcetera 8 different driver versions but so far no good. The latest I could find on the NVidia forums about problems with the GTX295 is from last Februari. But no solution. So, my questions are: - has anybody else had this problem - has this card (particular model) been overlooked by NVidia - what version of NVidia driver does Matt use.
nomdeplume Posted June 30, 2011 Posted June 30, 2011 SLI support for the 295 has always been sub-par compared to what you get when you have two discrete cards in SLI, IMO. However I think that only really applies to the configuration interface not showing as many options. I have Multi-GPU rendering mode set to 'NVIDIA recommended', and in the program settings it says 'NVIDIA recommended (Multi-GPU)'. You can use the nVidia Inspector tool to get nice graphs of your GPU usage to verify SLI is actually enabled and functioning. I'm currently on driver version 270.61. But I haven't had any issues for some time with earlier drivers. (I only have one 295, though.)
hsth Posted June 30, 2011 Author Posted June 30, 2011 Thanks for the quick response. I use a similar tool, GPU-Z, and as you can see in the attached picture it shows that the two cards are connected and that SLI is enabled for 4 GPU's. So why is it that the newer NVidia drivers report "SLI connection not found" when the software is installed?
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