I have a question about the R9 270X. It appears to me to be over-performing in the benchmarks: specifically on TechPowerUp. The expectation based on rumors of specs was that it would be between the 7870 and 7950, and probably closer to the 7870 end. But check this:
TPU > R9 270X Performance Summary
At 1080p they've got it performing 1% below the 7950 across the spectrum. That seems inexplicably close. It's 9% faster than the 7870. Furthermore, check these:
TPU > VTX3D 7870 XT Performance Summary
TPU > Club 3D 7870 XT Performance Summary
Both of those have the 7870 XT coming in at 3% behind the 7950 on 1080p. Given, there were a few different games in the roundup, but beyond that, the test setups are virtually identical (trading the 3770K for the 4770K in the 270X review). Ergo, the 270X appears to be out-muscling the 7870 XT. Yet compare the architecture:
7870 XT vs. 270X
4313 > 2800 Transistors
352 > 212 die size
2GB = 2GB VRAM
925 MHz < 1000 MHz Core Clock
1500 MHz > 1400 MHz Memory Clock
1536 > 1280 Shaders
96 > 80 TMUs
32 = 32 ROPs
256 = 256 Bus Width
Furthermore, in those TPU benchmarks, both of the 7870 XT cards had been pre-boosted by the manufacturers to 975 MHz. How [redacted] does any of this make sense?
Tom's Hardware and Techspot didn't seem as impressed with the 270X. Tom's Hardware concluded it was "slightly faster" than the 7870; uh, they don't appear to have reviewed their own review. On the gaming benchmarks, not the synthetics, the 270X beat the 7870 in FPS every single time, and it even equaled or beat the
GTX 760 on three of the seven games they tested:
Arma III,
Skyrim, and
Tomb Raider.
Meanwhile, Techspot wrote, "In all seriousness though, this release from AMD is disappointing to put it mildly. Essentially anyone who has purchased the Radeon HD 7870...graphics cards basically already has the Radeon R9 270X. For over a year it's been possible to purchase a factory overclocked 1.1GHz Radeon HD 7870..." which hammers a pet peeve of mine: equivocating a lesser card, overclocked, to a better card, at stock. Hell, in the next paragraph he acknowledges it was ~6% faster across the board after he tried to make this seem like it was purely insignificant. Again, the 270X outperformed- this time the 7950- on several of their gaming benchmarks.
Can someone explain? I don't see how this could be a cook. It's this purely better DX11 optimization? All these benchmarks were on 11.1 drivers.
Warning issued for profanity.
-- stahlhart