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The AMD Radeon R9 285 Thread

jbox5 said:
I picked up a Sapphire R9 285 OC and it works fine graphically, runs cool etc. However, in anything with DirectX acceleration I'm getting audio glitches. I've verified it's related to DirectX specifically - if I use OpenGL renderers it's fine. If I uninstall the graphics card drivers it's fine. Run something as simple as a video in VLC with the Direct3D renderer and I get clicks/pops every few seconds but switch to the OpenGL renderer or any of the others and it goes away.

The rest of the machine is no slouch - it's brand new 5820k build with 16GB RAM, SSD, Gigabyte GA-X99-UD4 and 750 watt corsair PSU. I'm not doing any overclocking.

Anyone else experienced anything like this with one of these cards?
Click to expand...

Just wanted to follow up on my previous post about my issues with audio and the 285 I received - it turned out to be a dud card. Got it RMA'd, got a refund and got something different. Issues are gone.
 
CAT-THE-FIFTH said:
It appears the M295X which is based on Tonga has 2048 shaders(it is in the new iMac with a 5K screen).
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Yup with 4GB ram so more than likely still a 256bit bus.( no mention of the amount of shaders though)


Graphics

AMD Radeon R9 M290X graphics processor with 2GB of GDDR5 memory
Configurable to AMD Radeon R9 M295X with 4GB of GDDR5 memory
Click to expand...
 
Edit; Lol... ^^^^ :D

CAT-THE-FIFTH said:
It appears the M295X which is based on Tonga has 2048 shaders(it is in the new iMac with a 5K screen).
Click to expand...

yup

humbug said:
Looks like AMD are confirmed for iMac 5K

http://www.theinquirer.net/inquirer...s-5k-retina-display-update-gbp1-999-price-tag

AMD Radeon R9 M295X Mobility Chip To Feature Tonga GPU

GPU Core: Tonga
GPU Cores: 2048
Core Clock: 800MHz
VRAM: 4GB GDDR5
Memory Clock: 1375MHz
Memory Bus: 256bit
Click to expand...

humbug said:
I think Competitive GPU's are on the way, but they also need to move with a new generation of APU's and CPU's.
Click to expand...
 
humbug said:
It would have been interesting to see a 2816 Shader 512 Bit bus Tonga GPU, i think it would have destroyed a 290X and be a bit more power efficient.
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With those specs it would have been about 5% faster

It is a bit like comparing a 285 to a HD7970 or 50

Having said that the Tonga architecture would give the opportunity to pack a lot more than 2816 shaders onto the core due to the better efficiency.
 
Kaapstad said:
With those specs it would have been about 5% faster

It is a bit like comparing a 285 to a HD7970 or 50

Having said that the Tonga architecture would give the opportunity to pack a lot more than 2816 shaders onto the core due to the better efficiency.
Click to expand...

With a lower core clock, 50% smaller bus the 285 is faster than the 280, sometimes faster than the 280X.

So it would be anything from 10 to 25% faster.
 
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