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Forums - PC Discussion - AMD Fiji XT R9 390X Specs Leak – 4GB of 3D Stacked HBM and 4096 Stream Processors

Kirin_gaming said:
JEMC said:
As a rumor is looks good (so a beast of a GPU), but why would AMD go with 4GB of VRAM when some current games are already asking for more?

^ This.

We really need more than 4gb of vram my 780ti tri sli is crying... its godly power is held back by its miniscule vram at 4k.

Well not really, only in a few games I've had to turn down textures a bit, but 6gb vram will soon become the norm for 4k gaming.


Wasnt there talk about HBM ram completely outperforming GDDR5? Like 4x ++  the speed?



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That could get them back in the game for sure. Especially if Nvidia are skipping 20nm as rumored, as that would mean that Nvidia would be stuck on 28nm until 16nm is ready some time in 2016.



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JEMC said:
Kirin_gaming said:
JEMC said:
As a rumor is looks good (so a beast of a GPU), but why would AMD go with 4GB of VRAM when some current games are already asking for more?

^ This.

We really need more than 4gb of vram my 780ti tri sli is crying... its godly power is held back by its miniscule vram at 4k.

Well not really, only in a few games I've had to turn down textures a bit, but 6gb vram will soon become the norm for 4k gaming.

Actually, RAM is not much of a bottleneck with the actual cards. Some board partners have launched 8GB versions of the 290X and at least the Sapphire one doesn't perform so much better than a 4GB regular one.

http://www.tomshardware.com/reviews/sapphire-vapor-x-r9-290x-8gb,3977.html

(note that both are clocked at the same speeds)

 

But I was thinking more about the games asking for more than 4GB of VRAM to use the highest settings.


Nice info right there, thank you.

I suppose then, that cards are just not completely optimized yet for 4k and above resolutions.Ive got another setup for fps and racing games,x2 r295x running at 5760x2160,the only bottleneck I found was from the cpu,but got a better one and that fixed it,maybe my 4k rig has the same problem.



Kirin_gaming said:
JEMC said:

Actually, RAM is not much of a bottleneck with the actual cards. Some board partners have launched 8GB versions of the 290X and at least the Sapphire one doesn't perform so much better than a 4GB regular one.

http://www.tomshardware.com/reviews/sapphire-vapor-x-r9-290x-8gb,3977.html

(note that both are clocked at the same speeds)

 

But I was thinking more about the games asking for more than 4GB of VRAM to use the highest settings.


Nice info right there, thank you.

I suppose then, that cards are just not completely optimized yet for 4k and above resolutions.Ive got another setup for fps and racing games,x2 r295x running at 5760x2160,the only bottleneck I found was from the cpu,but got a better one and that fixed it,maybe my 4k rig has the same problem.

You game on a 6 screen (3x2) Eyefinity setup? That sounds both amazing and bezel nightmarish to me .



Please excuse my bad English.

Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070

Steam / Live / NNID : jonxiquet    Add me if you want, but I'm a single player gamer.

I don't really know what most of this means, but it sounds good! :3



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JEMC said:
Kirin_gaming said:
JEMC said:

Actually, RAM is not much of a bottleneck with the actual cards. Some board partners have launched 8GB versions of the 290X and at least the Sapphire one doesn't perform so much better than a 4GB regular one.

http://www.tomshardware.com/reviews/sapphire-vapor-x-r9-290x-8gb,3977.html

(note that both are clocked at the same speeds)

 

But I was thinking more about the games asking for more than 4GB of VRAM to use the highest settings.


Nice info right there, thank you.

I suppose then, that cards are just not completely optimized yet for 4k and above resolutions.Ive got another setup for fps and racing games,x2 r295x running at 5760x2160,the only bottleneck I found was from the cpu,but got a better one and that fixed it,maybe my 4k rig has the same problem.

You game on a 6 screen (3x2) Eyefinity setup? That sounds both amazing and bezel nightmarish to me .

lol the bezel is not a problem, the monitors I got have a really thin bezel.

Building that rig though is one of the worst decisions I've made in my life,I'm I house flipper and I fix the houses as I live in them,since I'm always moving I always have to disassemble it,sometimes I don't even set it up, so yeah for anyone thinking of building a 6 screen rig, make sure you don't move a lot...



Arkaign said:
The rumor mills always have a field day with this kind of clickbait ahead of major GPU releases.

I've followed this stuff since the 80s, and this list of rumors is clearly created by someone who tried hard to make it look realistic, and failed. It's like a spec-sheet for a 14nm or 16nm GPU (true full 14nm lithography, not 20nm/22nm finfet).

Why? Because what we're talking about here would end up being significantly larger and hotter than GTX480 was on 40nm, along with correspondingly higher power consumption.

It's not entirely unlikely that HBM might be ready in small quantities, but I also think that's more likely to hit around Q3-Q4 2015.

I doublechecked my former infos, and the chip seems quite legit. AMD had a Tape-Out of a 500+ square millimeter chip lately, which would fit for this specs. The only thing I do not really believe are the 20nm in the OP. The HBM Chips are made in 20nm, but the graphics Chip itself probably not.

HBM is already in its second Generation (the first one was more like a test) and production has already started. Which means it is very likely there will be enough of them for a late Q1-Q2 release date if the yield rate ain't too bad.

HBM also has a much simpler memory controller. Depending on the one used in the previous Chip the TDP gain can vary from 5W up to 50W. Combined with an incremental update of the GCN Architecture it is very possible to get this Chip down to 250-300W TDP. Besides, there had been another leak with exactly the same specs exept the Chip only clocking at 800Mhz, which might indicate that AMD goes again the dual mode (quiet mode and uber mode) like they did with the 290X.

JEMC said:
As a rumor is looks good (so a beast of a GPU), but why would AMD go with 4GB of VRAM when some current games are already asking for more?

AMD came up with new, vastly improved color and texture compression techniques, which results in less memory needs. It's the reason why AMDs Radean HD 285 only have 2GiB of RAM while the 280, which it intends to replace, had 3.

Another reason could be practical: HBM is a new, not yet fully proven technology and pretty much unknown yield rates. Had they put 8 GiB onto the Graphics Cards, they might not have enough of them at the time of the scheduled release. 4 GiB is still a good compromise, and like I said, AMDs new compression technologies should alleviate the problem quite a bit.

Besides, just like the 290X lately, I'm pretty sure there will be Versions later on with double as much RAM as the normal Version



Bofferbrauer said:
JEMC said:
As a rumor is looks good (so a beast of a GPU), but why would AMD go with 4GB of VRAM when some current games are already asking for more?

AMD came up with new, vastly improved color and texture compression techniques, which results in less memory needs. It's the reason why AMDs Radean HD 285 only have 2GiB of RAM while the 280, which it intends to replace, had 3.

Another reason could be practical: HBM is a new, not yet fully proven technology and pretty much unknown yield rates. Had they put 8 GiB onto the Graphics Cards, they might not have enough of them at the time of the scheduled release. 4 GiB is still a good compromise, and like I said, AMDs new compression technologies should alleviate the problem quite a bit.

Besides, just like the 290X lately, I'm pretty sure there will be Versions later on with double as much RAM as the normal Version

Yeahm that is true.

But as I said, it's kind of sad to see them missing the change to go with more VRAM because they could attrack not only AMD fans or serial upgraders that go with whatever the fastest card is when they upgrade, but also get onboard those who fear that 4GB is not enough, not even at 4K but at lower resolutions with game developers asking 6GB to use the highest quality textures.

And no matter what "magic" works behind the scenes to make better use of memory, if the game is coded to "need" X amount of RAM, you either have it and can play at the highest settings or you don't have it and have to accept that the top of the line GPU that you just bought will "only" be able to run those games on High.

And that mentality is the one that could make AMD win more sales.



Please excuse my bad English.

Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070

Steam / Live / NNID : jonxiquet    Add me if you want, but I'm a single player gamer.

Sounds interesting! That sounds like a lot of power (On paper at least). Wish it had more VRAM though, especially for a flagship card.

Hopefully AMD has improved the TDP of their cards. The 290 and 295 were on par with nuclear reactors.



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PORN for my ears. Although I'm not a pc gamer no more, all this tech talk still makes me exited. Hope amd can pull this off and stay ahead of Nvidia. I'm more of a red guy...



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