Isn't the main difference for encoding or something? I could possibly test render times for a codec that supports the faster mode vs. one that doesn't and see if there is some kind of advantage.Your 9900K result seems promising.
Isn't the main difference for encoding or something? I could possibly test render times for a codec that supports the faster mode vs. one that doesn't and see if there is some kind of advantage.Your 9900K result seems promising.
Isn't the main difference for encoding or something? I could possibly test render times for a codec that supports the faster mode vs. one that doesn't and see if there is some kind of advantage.
Yeah but Linus Tech Tips was saying they used KF CPUs, which I assume they would have used a utility to test that. And they said that is how Apple is keeping things cooler by not having to run that part of the CPU. So Apple would want to keep each unit similar, and keep each unit cool, and mine runs fairly cool, so they must be disabling the integrated GPU, right? And if they are disabling the integrated GPU, wouldn't the encoding acceleration stuff be disabled? And I think that's the point of this thread. So it could be put to rest once and for all if I could run some sort of test. I'm just not sure what thing I should be testing for people. I think my iPhone records h.265 HEVC 4K and my Sony a7R III records regular h.264 4K but at a little bit higher bitrate.Apparently the KF are K processors with faulty internal graphics and they are still selling them to keep up with demand.
I don’t know if it really matters but when I bought it I was thinking the i9 was a 9900K with internal graphics. Not saying my 580x graphics card will fail but if it ever does it would be nice to use the internal graphics to get by.
My i9 iMac arrives soon.
Yeah but Linus Tech Tips was saying they used KF CPUs, which I assume they would have used a utility to test that. And they said that is how Apple is keeping things cooler by not having to run that part of the CPU. So Apple would want to keep each unit similar, and keep each unit cool, and mine runs fairly cool, so they must be disabling the integrated GPU, right? And if they are disabling the integrated GPU, wouldn't the encoding acceleration stuff be disabled? And I think that's the point of this thread. So it could be put to rest once and for all if I could run some sort of test. I'm just not sure what thing I should be testing for people. I think my iPhone records h.265 HEVC 4K and my Sony a7R III records regular h.264 4K but at a little bit higher bitrate.
Enjoy your i9 iMac. My buddy just ordered one yesterday, same specs as me but with the 1TB SSD, and it's not supposed to get here for a couple weeks, which he seems kinda bummed about. I might have him run CPU-Z out of curiosity once I help him get Bootcamped Windows up and running on an external drive which is gonna be a PITA.
Based on what I've seen from this thread I am 99% sure that Apple is using regular K series processors (it would be pretty crappy for Apple to run another chip lottery so that some get QuickSync and others don't on such a high end and pricey machine).
Is it known that the KF chips disable the video compressors/decompressors in addition to the main GPU?
That is the difference between the k and the kf. The kf has the igpu disabled off.
Yes, but - the video compression/decompression isn't really part of the iGPU. It is a whole separate block of silicon. It is conceivable that all these extra modules are still enabled in the KF parts - and only the UHD630's 24 execution units (i.e. 192 shading units) are disabled.
In this case, it appears that Linus Tech Tips are wrong.Yeah but Linus Tech Tips was saying they used KF CPUs, which I assume they would have used a utility to test that. And they said that is how Apple is keeping things cooler by not having to run that part of the CPU. So Apple would want to keep each unit similar, and keep each unit cool, and mine runs fairly cool, so they must be disabling the integrated GPU, right? And if they are disabling the integrated GPU, wouldn't the encoding acceleration stuff be disabled? And I think that's the point of this thread. So it could be put to rest once and for all if I could run some sort of test. I'm just not sure what thing I should be testing for people. I think my iPhone records h.265 HEVC 4K and my Sony a7R III records regular h.264 4K but at a little bit higher bitrate.
Enjoy your i9 iMac. My buddy just ordered one yesterday, same specs as me but with the 1TB SSD, and it's not supposed to get here for a couple weeks, which he seems kinda bummed about. I might have him run CPU-Z out of curiosity once I help him get Bootcamped Windows up and running on an external drive which is gonna be a PITA.
KF CPUs do not have Intel QuickSync Video because QuickSync is dependent on the iGPU being present. KF CPU’s iGPU is there, but it is disabled. Check this URL - https://ark.intel.com/content/www/us/en/ark/search/featurefilter.html - and filter by QuickSync = YES.
https://ark.intel.com/content/www/u...9900k-processor-16m-cache-up-to-5-00-ghz.html
Intel page for i9 9900k lists quicksync
https://ark.intel.com/content/www/u...900kf-processor-16m-cache-up-to-5-00-ghz.html
Intel page for i9 9900kf does not list quicksync at all. Is why quicksync = no doesn’t return any as either lists or doesn’t mention quicksync full stop.
What more does anyone need. These aren’t marketing releases etc but the vendors specification pages for the cpu’s.
Another thing that I would be interested in is the motherboard chipset apple used and whether they upgraded the four USB-A ports to 3.1 Gen 2 (10Gbps) speed to save iMac owners having to waste thunderbolt ports on connecting USB SSDs (if you want to get closer to their full potential).
The standard System Information indicates that the USB-A ports are limited to 5 Gbps. My guess is that they are USB 3 (not the very similar USB 3.1 gen1) just like in the 2017 iMac but I don't know how to tell the difference or whether it matters.
My Samsung T5 is connected via one of the USB-C/TB ports.
Yes.So just to confirm, in system profiler it shows a link speed of 5Gbps when the T5 is connected to a USB A port and a link speed of 10Gbps when the T5 is connected via the USB-C/TB port?
This is the one I meant to post.
In all seriousness, the fact that CPU-Z picks up the KF designation strongly implies that CPU-Z could be used to identify imacs with the KF part.
Can we really trust Linux Tech Tips?
Its true? KF inside iMac 27'? I am a bit matted in screenshots
Hi mate any issues you’ve found fitting the i9 9900KF in iMac as I’m able to get one $200 cheaper than a 9900K here currentlyI installed i9-9900KF in my system about 3 months ago and have no issues (at least with what i use)
My other PC has i9-9900K CPU and i can replace it right now. But don't want to do unnecessary job.
What's why I decide to test iMac before gluing it back.
Any suggestions for testing?
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