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This YouTube video has actual game footage with FPS from BF1, Witcher, GTA and Fallout

 
This looks like it's based off of the RX 580 not the Radeon Pro 580.

The Radeon Pro 580 uses the same GPU as the RX 580, it just runs it at a lower clock to reduce the TDP.

Interesting that GTA only saw 4 of the 8GB, though. Maybe it only reads that much?
 
Too bad 1080p looks blurry on the iMac. I imagine most folks are going to want to run 1440p at a minimum.
 
1080p wouldn't look good on any non-1080p monitor, and 1080*1920 is too little for most desktop tasks, photo editing, etc. I' argue that a 5K display is still better than, say, a 1440p display for 1080p gaming. Since the pixels are twice smaller, there is more headroom for pixel interpolation during rescaling.
 
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I think the new iMac display also has only max 60hz. FPS over 60 will give you no benefit.
 
The Radeon Pro 580 uses the same GPU as the RX 580, it just runs it at a lower clock to reduce the TDP.

Interesting that GTA only saw 4 of the 8GB, though. Maybe it only reads that much?

Gotcha ok didn't know that my bad thank you for clarifying.
 
Bought a 27" iMac. Upgraded to 4.2 GHz i7, 1 TB SSD.

Used an institutional affiliation to get a discount on base price and upgrades. Paid about $3k "out the door," including tax.

Going to buy 32-64 gigs of RAM on Amazon and manually upgrade that before even turning it on.

Delivers in a couple weeks. Will post back before the end of the month with how it's been in my experience for anyone who's considering.
[doublepost=1497126774][/doublepost](Speaking of upgrading RAM, does anyone have any idea if this machine supports quad-channel memory, or just dual-channel?)

Quoting myself as a little reminder. iMac arrives shortly. Busy schedule lately but hope to have some impressions posted in case it's useful to others over the next week or two. Windows 10 Pro ISO downloaded to my laptop and RAM sitting on my desk in waiting.

(If anyone happens to know anything about the current standing of FileVault 2 and Bitlocker working together on the same disk as I posted in the macOS forum, I'd appreciate it -- planned on encrypting the whole internal SSD one way or another, ideally by way of all first-party software. Would be nice to FV2 the macOS partition, Bitlocker+password Windows, and just option-boot.)
 
My i7 580 1TB SSD arrived yesterday. I added 32GB of Crucial RAM to the stock 8GB. Still setting everything up but did play about 30min of XCOM2 (MacOS) at 1440p. Most settings at high (turned down AA) and getting mid-30s FPS with no stuttering. After a few minutes the fan does spin up to 2600-2700 rpm and it is definitely audible but not too loud (especially with speakers turned up). That is the only time I heard the fan in the last two days, at idle (1200) it's pretty damn quiet.
 
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OP here. iMac set up, FileVault 2 finishing up... after a long adventure with the "black screen of death" on startup. Ultimately tried multiple SMC resets, RAM reinsertion, etc -- even tried to boot without RAM to see if I got a warning beep as troubleshooting -- ultimately managed a PRAM reset without knowing if the machine was booting or not since there's no chime anymore.

Anyway, posting from this beauty. This screen is a thing to behold for sure. This is my first iMac.

Boot Camp setup to follow, then Bitlocker experimentation (see my other thread), then gaming and a few thoughts in case it's helpful to anyone down the road.
 
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BF1 still installing, but downloaded enough to allow playing through the intro scenes. Smooth as butter, almost always locked via V-sync at 60 FPS at 1440p at "high" everything without breaking a sweat, though with the occasional dip into the 50s-60s during heavy rendering of smoke and what have you; haven't tinkered much beyond that quite yet. Have no doubt that this will work just fine for my purposes.
 
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BF1 still installing, but downloaded enough to allow playing through the intro scenes. Smooth as butter, almost always locked via V-sync at 60 FPS at 1440p at "high" everything without breaking a sweat, though with the occasional dip into the 50s-60s during heavy rendering of smoke and what have you; haven't tinkered much beyond that quite yet. Have no doubt that this will work just fine for my purposes.

AppleInsider of posted their review of the i7 580 machine yesterday and he said it was a true masterpiece of a computer and respectably a decent gaming experience. He was playing battlefield 1 at 144p with all settings turned to the highest settings and was between 50-60 FPS constantly so this machine can definetely power through gaming!
 
I got a new imac 27' with the Radeon pro 580. I installed bootcamp on a external Samsung t3 SSD drive, to save some space on my ssd internal drive, it works wonderfully!
I installed witcher 3, the game runs at 60fps 1440p with all graphics to maximum (except "hairworks" which is useless in my opinion). I'm very happy with the GPU. First time in my life i feel like my mac is a very decent game machine.
GTA V also run very well, test scenes shows between 60 and 80 FPS, at 1440 with almost all settings to maximum except MSAA)

Wow, very impressive, fianlly a mac that can game on 1440p! Yay....
I order same unit only with i5, hope that wont impact greatly on performance
How much did the t3 samsung SSD cost you and how many GB is it?
Witcher 3 takes ages to load unless u have a good ssd, so how were the loading times with the external ssd?
 
No one has mentioned this, So I will. iMac's will only work for gaming for so long. If you are on the Mac OS side of things. Do not upgrade to each new version of Mac OS. You will see your game settings fall from Ultra to Medium over the next few years little by little. You will only have about a 2-3 *year* window of gaming before newer games run like crap on the graphics card.

But with Thunderbolt 3 being a reality and external GPU support coming. There might be a solution on the horizon.
 
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No one has mentioned this, So I will. iMac's will only work for gaming for so long. If you are on the Mac OS side of things. Do not upgrade to each new version of Mac OS. You will see your game settings fall from Ultra to Medium over the next few years little by little. You will only have about a 2-3 window of gaming before newer games run like crap on the graphics card.

But with Thunderbolt 3 being a reality and external GPU support coming. There might be a solution on the horizon.

It's not just iMacs it's every computer man. Graphics get more and more intensive over the years and the older hardware just can't keep up in the long run but I think that's a given with any machine you buy however, now that external GPUs are being supported I think buying an iMac is a safe bet for a good while.
 
It's not just iMacs it's every computer man. Graphics get more and more intensive over the years and the older hardware just can't keep up in the long run but I think that's a given with any machine you buy however, now that external GPUs are being supported I think buying an iMac is a safe bet for a good while.

It's way more harsh on iMacs then PC's.
 
Hopefully, the the new graphic API (Metal) will fix that, as Apple won't let it stagnate the way they did for openGL.
And you could alway use boot camp.
 
BF1 still installing, but downloaded enough to allow playing through the intro scenes. Smooth as butter, almost always locked via V-sync at 60 FPS at 1440p at "high" everything without breaking a sweat, though with the occasional dip into the 50s-60s during heavy rendering of smoke and what have you; haven't tinkered much beyond that quite yet. Have no doubt that this will work just fine for my purposes.
Say, did you download drivers from
bootcampdrivers.com and did you see any FPS or performance boost? :)
 
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Quite a bump of my own thread. Yes and yes, difficult to quantify how much.
Of course - now that the rumors begin of a possible 2018 iMac, I was searching through the forums :) Thanks for answering!
 
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