We'll begin with a series of synthetic tests aimed at exposing the true, delivered throughput of the GPUs. In each instance, we've included a table with the relevant theoretical rates for each solution, for reference.
|Radeon HD 5870||27||68/34||154|
|Radeon HD 6970||28||85/43||176|
|Radeon HD 7970||30||118/59||264|
|Radeon R9 280X||32||128/64||288|
|Radeon R9 290||61||152/86||320|
|Radeon R9 290X||64||176/88||320|
|GeForce GTX 770||35||139/139||224|
|GeForce GTX 780||43||173/173||288|
|GeForce GTX Titan||42||196/196||288|
|GeForce GTX 780 Ti||45||223/223||336|
This color fill test is usually a better indication of memory bandwidth than anything else. The GTX 780 Ti lives up to its specs here, outperforming the 290X.
Nvidia's new flagship almost runs the tables in our texture sampling and filtering tests. Because the Kepler architecture can do full-rate FP16 filtering, the 780 Ti's lead over the R9 290X becomes commanding when we get into higher-precision color formats.
I'm not quite sure why the 780 Ti trails the GTX 780 and Titan in the FP16 filtering test. I double-checked the results, and they are correct. Could be that the 780 Ti is hitting some kind of thermal limit. That sometimes happens in these directed tests.
Tessellation and geometry throughput
|Radeon HD 5870||0.9||154|
|Radeon HD 6970||1.8||176|
|Radeon HD 7970||1.9||264|
|Radeon R9 280X||2.0||288|
|Radeon R9 290||3.8||320|
|Radeon R9 290X||4.0||320|
|GeForce GTX 770||4.3||224|
|GeForce GTX 780||3.6 or 4.5||288|
|GeForce GTX Titan||4.4||288|
|GeForce GTX 780 Ti||4.6||336|
I still don't have any answers from AMD about why the Hawaii-based products don't handle the higher levels of tessellation in TessMark all that well. Anyhow, the GTX 780 Ti has no such problem, and it cranks through the highly tessellated Unigine benchmark with ease, too.
|Radeon HD 5870||2.7||154|
|Radeon HD 6970||2.7||176|
|Radeon HD 7970||3.8||264|
|Radeon R9 280X||4.1||288|
|Radeon R9 290||4.8||320|
|Radeon R9 290X||5.6||320|
|GeForce GTX 770||3.3||224|
|GeForce GTX 780||4.2||288|
|GeForce GTX Titan||4.7||288|
|GeForce GTX 780 Ti||5.3||336|
The full-fledged GK110 acquits itself well here, but the R9 290X still has the edge in the majority of our shader tests. ShaderToyMark is probably the most interesting of these tests, and in it, the GTX 780 Ti makes major strides compared to the GTX 780 and Titan.