6x 750 Ti's (OC'd to stable + BIOS Power Mod)
Pretty please could you edit your post to include the exact make and model of your cards? It helps other people greatly

Thank you!
His results are consistent with my 8x Zotac 750 Ti's on Win7. Note that in my testing there was no need for the BIOS power mod since it yielded no increase hashrate or stability, just extra power consumption. My overclocking is +135 core, +600 mem on all 8 cards.
Benchmarking results of each of my Zotacs here:
https://bitcointalk.org/index.php?topic=167229.msg5441080#msg5441080Can you post up more system spec; motherboard, ram, psu...