Uhh... is this showing the 5000 as having the best graphic capabilities?
This is incorrect, right?
The better graphics performance by the air is probably due to it running a much lower display resolution than the retina MBP.
Uhh... is this showing the 5000 as having the best graphic capabilities?
This is incorrect, right?
Uhh... is this showing the 5000 as having the best graphic capabilities?
This is incorrect, right?
A guess?
The 2.6 i5 (and 2.8 i7) both run with a maximum GPU clock rate of 1200 MHz, the 2.4 is limited to 1100 MHz.
The MBA's 1.7 i7 is also 1100, while the 1.3 i5 is 1000 MHz.
As requested, Unigine Heaven run with AA off and at full screen:
Would you be willing to try the "preheated" thermal throttling test I proposed? Launch Unigine Heaven on all 3 machines, let it run for maybe 15-20 minutes, and then start the actual benchmark at that point?
Here is the result of a 'preheated' Heaven benchmark. I ran Heaven for 15 minutes on both the Intel 5000 Macbook Air and the Intel Iris MacBook Pro before kicking off the benchmark. Temperatures registered a pretty constant 78 degrees Celsius on both machines for the duration of the test.
Remember, the rmbp is drawing 2x the pixels as the air. That explains why the results are so similar.
Can anyone explain why TDP isn't affecting these benchmarks at all? They're all so very close.
Kinda makes me think they could've just fitted the rMBP with a i5-4250U at 1,3 ghz. Where's the catch?
Two issues:
-A chip will exceed TDP if its thermal conditions allow it. So unless the system heats up into the 90's and is unable to bring the temperature down with its fans, the chip will continue to draw more than 15W as long as the software asks for that much power (which games and benchmarks basically always do unless they're frame capped).
What we may actually be seeing is that the cooling on the Air and rMBP 13" isn't as different as the designs would suggest. Personally I wasn't aware until recently that older MBPs (pre-underside vents) actually already drew air through the ports instead of just exchanging at the hinge only, which should also be what the Air does.
-Benchmarks like this basically only tax the GPU, unlike real games where the CPU may also have lots of work to do (handling networking and interpolation/predicton, running AI routines, physics, etc.).
There are some interesting benchmarks out there which show the i7 Air as being in between the 2.6 and 2.8 options on the rMBP, but this only applies to single core performance. When the system tries to load both cores the rMBP CPUs pull ahead, though even the 2.8 only has like 10% on the Air's i7. In full dual core load it basically matches the 13" rMBP's 2.4.
In general it seems like the ULV chips are really impressively efficient. I think Intel's entire CPU lineup this year is being marketed a little deceptively; The Air's i7 "1.7" chip is really very close to the rMBP's i7 "2.8" chip in reality. Of course if we want to talk reality they are physically the same chip with different binning and TDP regulation. We might discover that the ULVs are actually better chips with a major under clock and more aggressive power limits, which is how they produce such amazing battery life (higher binned chips hit the same clocks at lower voltages).
Thank you for clearing this up. I'm still wondering though: if TDP seems to matter so little due to cooling mechanisms, why didn't they ship the rMBP's with ULV chips? They cost the same, but draw less idle power.
Honestly I think they basically did. That's why I said the marketing on Intel's end is deceptive; I'd say those chips in the rMBP 13" idle much lower than their base clock names. Even in Ivy at the desktop level (so double the TDP of 15" rMBP parts and no iGPU in use) my 3770K, which is marketed as a base 3.5 Ghz chip, actually idles well below 3Ghz (I could go check, but I'm not at home). I think it actually hangs out around 2Ghz at idle.
IMO only look at the boost clocks and TDP when looking at Intel chips. So in that context, we have:
Air i5: 15W 2.6
Air i7: 15W 3.3
13" rMBP: 28W 2.9
13" rMBP: 28W 3.1
13" rMBP: 28W 3.3
I think when you look at it like this the performance numbers now basically line up with the stats. The Air's i7 falls just short of the rMBP's i7 on single core (and I mean within a couple percentage points), but loses out by 10% on dual core (the TDP limitation appears).
Problem is if you advertise with these stats only people will be very confused about what's better. Then again, according to the results maybe they should be.
Wanted to bring this up from another thread:
According to notebook check,
the 1.3 i5 MBA (HD 5000) scores a 1,035 on 3DMark11
the 1.7 i7 MBA (HD 5000) scores a 1,070 (Some results on Futuremark's website go up to 1,200)
and the 2.4 i5 rMBP (Iris 5100) scores a 1,164 (Some results on Futuremark's website go up to 1,300)
Even though they're synthetic benchmarks, that's not even a 10% gain in performance. And all of the tests were run at the same res (3dMark11 must have looked awful on the rMBP...)
If you think about it, the fairly significant energy savings might actually be worth the slight loss in performance ... if you don't care for the Retina display. Laptopmag did a mini review on the Haswell i7 MBA and said that it actually has a better battery life than the Haswell i5. They said that the higher powered CPU w/ the same TDP was actually more power efficient.
Shh, don't let the Air i7 zealots hear you say this blasphemy...