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Old 06-12-18, 04:37 PM
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AlienALX AlienALX is offline
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Fury and Vega were AMD's Fermi. In a funny twist of events Nvidia are back to making Fermi and AMD are about to make Kepler.

And you know what? I foresee a massive comeback for AMD. All of this BS that heavy GPUs are supposed to do are limited to PC only. Meaning no one bothers to code for them.

/neck coming out.

I suspect that if AMD GPUs were coded for to utilise them properly then Vega 64 would have been almost as fast as the 1080Ti. However, due to no one bothering it isn't anywhere close.

I would also surmise that if people coded with the Fury in mind it too would have been a lot better (IE limit the game's engine to using 4gb or less). Thing is? Nvidia already had a 12gb consumer GPU out there so why give a F?

All of these supposed claims about "Oh it's HBM so don't worry if you think it's not enough because it is" all turned out to be false and when the card ran out of VRAM it then ground to a halt, before eventually crashing your PC. I know, I saw it in BLOPS III loads of times !

Then AMD say they have fixed it so I set to work trying to figure out this "fix". Well, by now I knew exactly what levels and what scenes made the VRAM buffer overflow, and so I tried them (with the same settings hacked into place because the game disables them when it sniffs the VRAM) again. The game no longer crashed, woohoo right? well no. After some investigation of my PC's resources it was clear that the card was "texture streaming" from my paging file on the hard drive. And as you can imagine this is as slow as the slowest thing in the world. FPS dropped from 60s to low 20s.

At least with Vega they sort of bothered putting more on. I still wouldn't buy a Vega card though.

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  #22  
Old 06-12-18, 05:07 PM
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AngryGoldfish AngryGoldfish is offline
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Quote:
Originally Posted by Kaapstad View Post
I have seen these comments about how little power HBM uses compared to GDDR.

I don't think these people actually know what they are talking about to be frank.

I would agree there is a very small drop in power usage with HBM but not that much.

With the arrival of the 2080 Ti and RTX Titan it goes someway to proving that GDDR does not use much more power than HBM. If you compare the Titan V and the Turing cards the former has a slightly bigger core and the latter cards clocks higher but the actual difference in TDP between these 12nm cards is about 30watts.

https://www.techpowerup.com/gpu-specs/titan-v.c3051



https://www.techpowerup.com/gpu-specs/titan-rtx.c3311



I think the problem with AMD using HBM was it seemed like a good idea at the time and it looked like the way things would go in the future but unfortunately a lot of the promises and claims for the new memory did not materialise.



I have used a number of HBM equipped cards and they all tend to perform the same way.


1. They throttle a bit at 1080p compared to GDDR cards.


2. They are better at 1440p and 2160p where bandwidth counts for more than high clockspeed.



I would also agree with what other people have said that for professional use HBM is also very good.
Do you know who I'm talking about, the guy with the crazy hair? It's the dude who quite literally takes graphics cards apart and reviews them based on the component choices. The dude who overclocks using LN2. The guy who buys old GPUs and destroys just to learn why. The guy who writes articles for one of the biggest PC hardware sites in the world. I don't like the fallacy of, 'But bro, he's, like, totallyu so much smarter than you so you're wronggggg, brah'. But at the same time, I can't think of a more fitting response. The article breaks down the math. He's not just compared two TPU reviews out of context. The 16GB of HBM2 on the Vega FE card was tested using a DMM to be drawing no more than 20-30W. To reach the same kind of bandwidth as HBM2 that AMD have used in the past with GDDR5 (512-bit), power draw from the memory would go up to 80-100W. The memory bus of the 1080Ti (352-bit) would draw 60-70W of power. That's over double the power draw of HBM while considerably reducing bandwidth. GDDR6 wasn't available at the time of Vega so we're comparing the bandwidth of GDDR5 or GDDR5X and against HBM2.
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