The 980 is quite a lot quicker than the 970, but it does carry a price premium. Hard to say though
how they might differ wrt what extent the 8350 could or would hold them back. I've been doing most of
my testing with fast CPUs to remove the CPU from the issue as much as possible, though I have been
testing with lesser CPUs when I can, and I will test with a Ph2 1090T when I can find the time (not yet
though). Trouble is, normal downloadable benchmarks do tend to gloss over CPU-related issues, not least
because where it matters the most (eg. online gaming, MMOs, real life setups where tasks like antivirus
checks might be running at the same time as a game) is exactly when it's the hardest to construct a
repeatable test. For pure GPU synthetics though (ie. CPU power not really a factor), there's some
good data on this thread (just be sure to check posts that have followed the test rules correctly,
quite a few users get it wrong):
http://www.techpowerup.com/forums/threads/unigine-heaven-4-0-benchmark-scores.198888/page-15
My GTX 980 scores 1800 (avg. 71.5fps), while someone else submitted a GTX 970 with a score of 1415 (avg. 56.2 fps), ie.:
http://www.techpowerup.com/forums/threads/unigine-heaven-4-0-benchmark-scores.198888/page-13#post-3196466
http://www.techpowerup.com/forums/threads/unigine-heaven-4-0-benchmark-scores.198888/page-14#post-3196984
(though someone else submitted a better 970 result, so the above card might be a lesser or stock speed model)
Have to say though, looking at your spec, I think you'd be better off getting a 970 and moving the OS
& installed games to an SSD. I could never go back to using rust spinners (mechanical HDDs I mean),
the difference is just too painful, from startup, app/game loading, etc. to general responsiveness and
the ability to handle background tasks without stalling the system. Plus, in game stuttering is greatly
reduced in relevant titles. These days, good models in the 256GB range are well priced, and/or there
are plenty of decent used items available (lots of 840/840 EVO, etc., on eBay, or indeed even the older
Samsung 830 is still a nice drive).
Would you be stretching your budget by getting a 980? Or is it well within your means? If the latter,
then heck, get a 980 and an SSD upgrade, I would. 8)
Note that for easier backups, etc., I split my gaming PC setup so that the OS is on a 128GB SSD while
all games are installed to a separate 256GB SSD (best of both worlds). At the time (few years ago)
the quickest model at a decent price was the OCZ Vertex 4, but these days I'd get a Samsung 840 Pro,
850 Pro, or 840 EVO if cost was a factor. Or I'd hunt for decent used models, including the OCZ Vector.
An SSD would certainly give a nice boost for general system usage aswell.
Ian.