Been a few years but with this cool weather, I thought I'd fire up F@H again and do something useful while keeping the room warm. My system is relatively old (Phenom II X6 1090T 3.2GHz @ 3.8GHz) and from what I'm reading, CPU folding isn't really worth much at all compared with GPUs. Is it worth running the CPU at all on a couple cores or is it just a detriment to the GPUs? It's funny looking through team stats since I'm ranked 55th in points and 4th in WU from the horde of [mostly P4] machines I used to fold with... GPU-wise, I have a pair of identical Sapphire R9-280 boards in an AMD 970 (x16 and x4) crossfire setup. Looks like PCIe bandwidth is definitely a bottleneck since I'm getting ~18,000 PPD from one board, and ~33500 PPD from the other. Couple questions for the pros here- Does enabling/disabling Crossfire matter? Output seems to float between 40,000 and 44,000 PPD with or without crossfile with both GPUs running and the CPU paused, so I'm guessing "no?" I'm reading good things about Windows 10 versus Win 7 for folding. I'm currently on Win 8.1, any idea if I'd see an improvement if I were to upgrade? Any other suggestions for getting the most out of this setup? Efficiency-wise, it seems like running the faster GPU is ideal, but also wondering what other things I'm not considering like the value of WUs from different projects. Edit: Any benefit to disabling programs like f.lux while Folding? Thanks for any tips!