Will a PCIe 3.0 x 16 gpu work in a PCIe 1.0 x 16 mobo slot. The Nvidia GeForce 8800 GT gpu I had quit. I need a gpu card comparable or better than the 8800 GT. I'm looking at a PNY GeForce GTX 750 TI video card. The computer I have is a Gateway FX7020. The mobo is an ECS MCP61PM-GM AM2 mATX powered by an AMD Phenom 9600 Quad-Core Processor with 4GB of memory, running 32-bit Vista. I gutted the original case and put everything in a new NZXT Source 210 case, for better air flow, and to accomodate a new 600-W Corsair PSU. Any advice would be appreciated.