VRing
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First look: Benchmarks put Apple's entry-level $4999 iMac Pro to the test
The W-2145 has a boost speed of 4.5 GHz, the W-2140B has a boost speed of 4.2 GHz. <-- The downclock.macplusplus said:
Turbo is for single core, dude...VRing said:
The stock Xeon W-2145 is supposed to turbo to 4.5 GHz and will not throttle. Most desktop cooling solutions can likely sustain even higher frequencies without throttling.macplusplus said:
No one would notice that minus 0.3 GHz in real life usage. The stock throttles more than that 0.3 GHz by the way...
“the clock speed to drop from 3.9GHz to about 3.6GHz for a second or two. This allowed the CPU to drop below 92 degrees, and the clock speed to rise back to the maximum 3.9GHz”
Apple's solution is downclocked and still throttles.
So your (mis)understanding "how may it throttle at 3.9 while it can Turbo at 4.5" doesn't make sense, you compare apples to oranges.
The W-2140B is seen throttling down to 3.6 GHz at sustained load. <-- The throttling.
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First look: Benchmarks put Apple's entry-level $4999 iMac Pro to the test
1) You're the one that's not understanding. The W-2145 is the standard model that will be used in every other Xeon W workstation. Apple's version is just a downclocked version of that chip. This has nothing to do with cost, which, by the way, likely costs more for Apple as they're not using the off the shelf variant. Unless of course they're just using the portion of the yields that couldn't become a full W-2145.PickUrPoison said:
1) A W-2145 is a 3.7/4.5 part, the W-2140B is a 3.2/4.2 part. Are you saying Apple should also offer the faster, more expensive chip? Fine, but that would be a $5,200 or $5,300 machine, not $5,000. You don’t get something for nothing. Apple is unlikely to offer 2 different speeds of 8-core though, so don’t hold your breath.VRing said:
The W-2140B is essentially a downclocked version of the W-2145. The same way the W-2150B is a downclocked W-2155.Apple isn’t even using a W-2145, let alone downclocking one.
These are straight up weaker versions of their regular counterparts.
Well beyond spec? What are you talking about. Turbo should be sustained. None of this looks promising.That said, I’m confused about the comments re: thermal throttling. From the article:In the multi-core benchmark, the 8 cores ran at 3.9 gigahertz, which seems to be the top CPU frequency when maxing out all CPU cores.and, during 10 consecutive multi core tests:
After the second test, each additional run would cause the iMac Pro to thermal throttle when the CPU reached roughly 94 degrees celsius, which caused the clock speed to drop from 3.9GHz to about 3.6GHz for a second or two. This allowed the CPU to drop below 92 degrees, and the clock speed to rise back to the maximum 3.9GHz.The base frequency of this processor is only 3.2GHz. So multicore performance seems well beyond spec.
That doesn’t explain the single core at 3.9 but if it can do 3.6 to 3.9 with all cores, 4.2 with single core would seem to be attainable wrt thermals. There may be some further optimizations possible, trading off fan speed (which was described as inaudible and seemingly near idle) with maximum clockspeed under various load conditions.
Looks very promising so far.
Even the overall performance is disappointing. A 1950X scores 3100 in Cinebench R15, meanwhile, the W-2140B scored 1680.
With your logic, you might just as well say Apple should only offer the 18-core at $7,400.
2) The part is spec’ed at 3.2GHz base frequency. In 2 different multicore tests, it benched at either 3.6-3.9GHz or a solid 3.9GHz.
A 3.2GHz part running at 3.9GHz with all cores at 100% is promising. The fan seemed not to be running. As I said, with an optimization of fan speed, 4.2GHz on one core would seem to be within the thermal capacity, since it’s easily beating its 3.2GHz base speed—upon which TDP is defined.
3) Mac workstations are typically purchased by those who want to use MacOS, so your comparison of this 8-core machine to a 16-core machine, which can’t run MacOS, isn’t particularly relevant. TCO isn’t maximized by simply buying the cheapest hardware available.
2) Nothing about that is well beyond spec. Sustaining speeds above the base clock should be expected for a desktop with a decent cooling + a PSU that draws power directly from the wall.
3) The point is that the performance as a workstation is underwhelming. Just because a macOS user has no other options is simply unfortunate. -
First look: Benchmarks put Apple's entry-level $4999 iMac Pro to the test
The W-2140B is essentially a downclocked version of the W-2145. The same way the W-2150B is a downclocked W-2155.Apple isn’t even using a W-2145, let alone downclocking one.
These are straight up weaker versions of their regular counterparts.
Well beyond spec? What are you talking about. Turbo should be sustained. None of this looks promising.That said, I’m confused about the comments re: thermal throttling. From the article:In the multi-core benchmark, the 8 cores ran at 3.9 gigahertz, which seems to be the top CPU frequency when maxing out all CPU cores.and, during 10 consecutive multi core tests:
After the second test, each additional run would cause the iMac Pro to thermal throttle when the CPU reached roughly 94 degrees celsius, which caused the clock speed to drop from 3.9GHz to about 3.6GHz for a second or two. This allowed the CPU to drop below 92 degrees, and the clock speed to rise back to the maximum 3.9GHz.The base frequency of this processor is only 3.2GHz. So multicore performance seems well beyond spec.
That doesn’t explain the single core at 3.9 but if it can do 3.6 to 3.9 with all cores, 4.2 with single core would seem to be attainable wrt thermals. There may be some further optimizations possible, trading off fan speed (which was described as inaudible and seemingly near idle) with maximum clockspeed under various load conditions.
Looks very promising so far.
Even the overall performance is disappointing. A 1950X scores 3100 in Cinebench R15, meanwhile, the W-2140B scored 1680.
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First look: Benchmarks put Apple's entry-level $4999 iMac Pro to the test
This is more of a Final Cut Pro machine than a real workstation, and not because it's the best option, but because it's the only option.wizard69 said:The thermal throttling is a huge problem in a professional machine. Sadly AI is seeing throttling in extremely light usage imagine how much you would loose over 8 hours.
Frankly this is not unexpected! Apples history with the word "pro" and cramming hot parts into a tight enclosure isnt good. Every day im becoming more and more convinced that Apple just doesnt understand the "PRO" market.
As a point of record i was looking at a iPad Pro in a store yesterday. Nice device but there is nothing about it that stands out as being pro. I do believe that common sense has left the building at Apple and has been replaced by marketing morons that likely have never engaged in professional work. Sad.
Then again, I'm not sure what anyone really expected from an all-in-one.
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First look: Benchmarks put Apple's entry-level $4999 iMac Pro to the test
The stock Xeon W-2145 is supposed to turbo to 4.5 GHz and will not throttle. Most desktop cooling solutions can likely sustain even higher frequencies without throttling.macplusplus said:
No one would notice that minus 0.3 GHz in real life usage. The stock throttles more than that 0.3 GHz by the way...
“the clock speed to drop from 3.9GHz to about 3.6GHz for a second or two. This allowed the CPU to drop below 92 degrees, and the clock speed to rise back to the maximum 3.9GHz”
Apple's solution is downclocked and still throttles.
