My 580 does 2200mhz ram very easily, id guess yours could too.
ive got mine undervolted -37mv and running at 1400mhz rn.
Id reccomend just continuing to crank the core clock until it crashes, increase 5-10mv and keep going until your crashing due to thermals (for me this was usually around 80C, though as you get higher in voltage you need lower temps to keep it stable)
My 580 is actaully able to clock 1500mhz with +150 or somthing like that mv but I dont have the cooling power for it usually (in winter with the window open i do).
Also my experience with my 580 has lead me to beleive that anything over 1300mhz basically doesnt change my fps in games or benchmarks. So thats why I decided on 1400mhz with an undervolt. (I was actually able to do somthing like -110mv and run 1350mhz (or something round there) core clock but the voltage was too low for the video decoder so it was stable in games but not watching youtube lol.
Also I'd reccomend using MSI afterburner, gives you control over everything on the card + fan curve
Edit:
heres my numbers for my undervolting, I used Unigen heaven for benchmarks:
-150 mv
coreclock 1350 mhz
FPS: 51.6
Score: 1300
Min FPS: 26.7
Max FPS: 106.3
Power consumtop ~ 102-4 watts
================
-93 mv (this ended up being unstable in long run, but i bet you could do -50 with no issues, i just left my other preset of -37 cause i didnt feel like messing with it anymore)
coreclock 1400
FPS: 52.8
Score: 1331
Min FPS: 27.6
Max FPS: 109.1
Power consumtop ~ 115 watts
=================
To download any version of cinebench, type cinebench into google!
To download cinebench 2003 go to > http://hwbot.org/ < then benchmarks> processor benchmarks> then click download. its a rar file so you will need to open it with 7zip or a similar program.
To download cpuz or gpuz, type them into google and get the latest version.
FAQ:
How do i get my score put on the spreadsheet?
You wait a very very very long time
How many times can i post my scores?
you can post as many scores as you like with as many different cpu's as you like. if you have 2 of the same cpu then let me know. only the highest score you get with a cpu will go on the spreadsheet. (e.g if you have a score with a 2500k@3ghz and then improve your score with your 2500k@4ghz then your score at 3ghz will be deleted and your score at 4ghz will go on the spreadsheet. if you get a with a 2500k@3ghz then upgrade your cpu to a 2600k@ 3ghz you will keep both scores.
Why is my gpu being beaten by a much slower gpu on the open gl test?
This will probably be because your cpu is slower single thread. the open gl benchmark is designed to be limited as much as possible by your cpu, so if your gpu is getting beaten by much slower gpu's. overclock your cpu more!
How do i run the single thread test?
In the top left hand corner, click file, then advanced benchmark. this should bring up 'cpu (single core)' underneath the normal cpu test. this test takes much longer as it only uses one core and one thread.
Post a screenshot of your score in this thread with cpuz so we know the clock speed (dont crop the screenshot)
Memory and motherboard tabs are optional, but are useful if you are looking for tips for higher scores
you can take a screenshot by press shift and prt sc on your keyboard.
then to see you screenshot open paint (with comes installed with every copy of windows)
then you can either press ctrl and v or paste in paint and the screenshot will appear in paint
you then save the file as a .jpeg somewhere you will be able to find it later
open the interwebs and upload it to your gallery on the forum or upload it to a place of your choice and simply copy and paste the image into a new post on this thread
Top tips to a high score:
1) Don't have any other programs running while you are doing the benchmark. This includes temperature monitoring software and cpuz. if you are concerned about your temps do one run with the monitor open to check they dont get too high, then another run without it open.
2) Overclock your cpu and gpu!
3) take your side panel off your case, open a window or go in a colder place. less heat+more overclock=higher scores.
4) Run the tests separately a few times this can get you that last extra point.
5) Run it on a fresh install if you can. fresh installs are always faster.
6) Don't use your 24/7 oc. top scores will be done with overclocks that might be too hot or too unstable for normal use.
7) more ghz on your cpu is always good, but make sure your ram is running at its full potential too. Normally 1600mhz cl8 will be faster than 1866mhz cl10. get that cl down as low as possible while trying to maintain a good memory frequency.
link to scores google doc (R20)> https://docs.google.com/spreadsheets/d/1ItbDCn4dPaJANGgFczL3uCZRquxZXQM9Kmn17kCBdZE/edit?usp=sharing
link to scores google doc (R15)> https://docs.google.com/spreadsheet/ccc?key=0AlC81MjwelBgdEZNV3l6aHl1eUNwSUR4Rml0MXMzN1E&usp=sharing
link to scores google doc (R11.5)> https://docs.google.com/spreadsheet/ccc?key=0AlC81MjwelBgdGpFa3BPaG5QRG1QREFPU3A0dWdVTlE#gid=0
link to scores google doc (2003)> https://docs.google.com/spreadsheet/ccc?key=0AlC81MjwelBgdGVQQnFRVUNxTjZPYVdjT1pDdHA0MUE#gid=0
R15 Extreme Score have now been integrated into the R15 sheet
Example Screenshots:
How your ram speed can affect your cinebench scores.
R11.5
Do a FULL DDU clean up of all AMD and Nvidia software then I stall the latest AMD driver. Also update your motherboard chipset drivera from AMDs website AND update your BIOS from the Board OEM website