I know Rangerjr1 will have a pop over the CPU, however personal best so far with a single R9 290(P) X.
i7 [email protected] Ghz Water Cooled
290(P) Flashed to X @1,220 Mhz/1,536 Mhz Watercooled.
AMD 14.9 drivers
SCORE
11517 with AMD Radeon R9 290X(1x) and Intel Core i7-3770K Processor
Graphics Score 13988
Physics Score 10982
Combined Score 5116
http://www.3dmark.com/3dm/4504496?
If you're maxing out the voltage on Trixx you can probably do 1600 on memory , try it out! And yes you really really should OC that i7 more if you want higher scores, whats keeping you from doing it ?