MJ:

How are you getting that level of performance out of a 7770? AMD sez those cards will do 1.28TFlops at single precision, at 1 ghz.

Also, for which project are you running OpenCL?

Thanks for your contributions.

Yeah, there's no way a 7770 gets 3.2TFLOPS.. those benchmarks are LIES!:) I'm using my radeons over at Folding at home for the time being. fahcore17 has some major improvements, but it's still in testing.

Cheers!

Is there any difference in actual performance? It looks like just a BOINC measurement artifact to me. Another GPU project I work on (not to mention any names) can't reliably identify the GPUs correctly in the right slots, let alone performance levels.

I have no idea, but they have always run at 3200 Gflops. I run Milkyway and Poem on these GPU's currenlty, but HCC ran at the same speed and clocked up 25m points...

May be these are rated at double precision by BOINC, thus the performance differnece between AMD and BOINC?

These are listed as one of the top GPU's in the list here thats why they are so popular, as far as value for money goes, they are the tops!

However, for brute force crunching power (and to break the bank!) the HD7970's are brilliant! I've got my 2 o/c to 12288 Gflops and stable at that!

This is the BOINC startup log entries, the first few lines

08/09/2013 16:59:41 |  | Starting BOINC client version 7.0.57 for windows_x86_64
08/09/2013 16:59:41 |  | log flags: file_xfer, sched_ops, task
08/09/2013 16:59:41 |  | Libraries: libcurl/7.25.0 OpenSSL/1.0.1 zlib/1.2.6
08/09/2013 16:59:41 |  | Data directory: D:\Boinc Data
08/09/2013 16:59:41 |  | Running under account Steve
08/09/2013 16:59:41 |  | Processor: 8 AuthenticAMD AMD FX(tm)-8350 Eight-Core Processor            [Family 21 Model 2 Stepping 0]
08/09/2013 16:59:41 |  | Processor features: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 htt pni ssse3 fma cx16 sse4_1 sse4_2 popcnt aes syscall nx lm svm sse4a osvw ibs xop skinit wdt lwp fma4 tce tbm topx page1gb rdtscp
08/09/2013 16:59:41 |  | OS: Microsoft Windows 7: Ultimate x64 Edition, Service Pack 1, (06.01.7601.00)
08/09/2013 16:59:41 |  | Memory: 31.92 GB physical, 63.83 GB virtual
08/09/2013 16:59:41 |  | Disk: 465.76 GB total, 172.80 GB free
08/09/2013 16:59:41 |  | Local time is UTC +1 hours
08/09/2013 16:59:41 |  | CAL: ATI GPU 0: AMD Radeon HD 7900 series (Tahiti) (CAL version 1.4.1741, 3072MB, 3032MB available, 12288 GFLOPS peak)
08/09/2013 16:59:41 |  | CAL: ATI GPU 1: AMD Radeon HD 7900 series (Tahiti) (CAL version 1.4.1741, 3072MB, 3032MB available, 12288 GFLOPS peak)
08/09/2013 16:59:41 |  | OpenCL: AMD/ATI GPU 0: AMD Radeon HD 7900 series (Tahiti) (driver version 1124.2 (VM), device version OpenCL 1.2 AMD-APP (1124.2), 3072MB, 3032MB available, 12288 GFLOPS peak)
08/09/2013 16:59:41 |  | OpenCL: AMD/ATI GPU 1: AMD Radeon HD 7900 series (Tahiti) (driver version 1124.2 (VM), device version OpenCL 1.2 AMD-APP (1124.2), 3072MB, 3032MB available, 12288 GFLOPS peak)

Note - these log entries are not from the machine/GPU's we've been discussing in this post, just the easiest machine to show the details in question.