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AMD Navi 12 Gets 256-bit memory bus according to Linux drivers, Radeon RX 5600 128-bit
A lot has been said and spoken already about AMD's upcoming NAVI 12 (RX 5600) and 14 (RX 5500). More information from Linux drivers indicates that AMD Navi 12 gets a 256-bit memory bus and the RX 5600 128-bit, likely GDDR6.
The news arrives today though a user at Germany based 3DCenter forums called Berniyh, he found Navi 12 and Navi 14 in Linux drivers, the two GPUs could end up in the RX 5800 and RX 5600 cards respectively. Navi 12 is mentioned to get a 256-bit memory bus. Navi 14 would, according to previously surfaced drivers, get versions with 3, 4 and 8 GB volume graphics memory but on a 128-bit memory bus.
»···» ··· case CHIP_NAVI10:
»···» ··· case CHIP_NAVI12:
»···» ··· »··· pc_lines = 1024;
»···» ··· »··· break;
»···» ··· case CHIP_NAVI14:
»···» ··· »··· pc_lines = 512;
»···» ··· »··· break;
"···"···default:
»···» ··· »··· assert (0);
"···" ···}"···" ··· if (info-> chip_class> = GFX10) {
»···» ··· »··· info-> pbb_max_alloc_count = pc_lines / 3;
»···» ···} else {
»···» ··· »··· info-> pbb_max_alloc_count =
»···» ··· »···» ··· MIN2 (128, pc_lines / (4 * info-> max_se));
"···" ···}
"···}»··· if (info-> chip_class> = GFX10) {
»···» ··· switch (info-> family) {
»···» ··· case CHIP_NAVI10:
»···» ··· case CHIP_NAVI12:
»···» ··· »··· info-> num_sdp_interfaces = 16;
»···» ··· »··· break;
»···» ··· case CHIP_NAVI14:
»···» ··· »··· info-> num_sdp_interfaces = 8;
»···» ··· »··· break;
"···"···default:
»···» ··· »··· assert (0);
"···" ···}
"···}
For the 5700 (Navi 10) A GPU with 8GB VRAM has a 256-bit wide memory bus, and is referred to as 'num_sdp_interfaces = 16'. Since NAVI12 is listed at 16 as well that would be 256-bit, NAVI14 at 8 SDP this is 128-bit. Interesting is the mention PC_lines, you'd think that's the number of shader procs, but really that cannot be the case. It is expected that the new cards will see the light of day in October.
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icedman
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#5715590 Posted on: 09/30/2019 04:06 AM
I can see these using gddr5 or gddr5x to keep costs down, gddr6 is expensive and I would think they want more to distinguish their products apart.
I can see these using gddr5 or gddr5x to keep costs down, gddr6 is expensive and I would think they want more to distinguish their products apart.
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#5715687 Posted on: 09/30/2019 11:41 AM
128bit is disappointing, as I know people who need more for work purposes but don't want to go 5700 due to price.
We'll have to wait and see.
128bit is disappointing, as I know people who need more for work purposes but don't want to go 5700 due to price.
We'll have to wait and see.
warlord
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#5715700 Posted on: 09/30/2019 12:17 PM
128bit is disappointing, as I know people who need more for work purposes but don't want to go 5700 due to price.
We'll have to wait and see.
Who cares about bit bus nowadays though? My 390X has 512bit but it ain't better than 256bit RX580/590 due to old arch and lower clocks! So, 5600 could easily be a better choice than RX500 series despite half the bus.
128bit is disappointing, as I know people who need more for work purposes but don't want to go 5700 due to price.
We'll have to wait and see.
Who cares about bit bus nowadays though? My 390X has 512bit but it ain't better than 256bit RX580/590 due to old arch and lower clocks! So, 5600 could easily be a better choice than RX500 series despite half the bus.
Undying
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#5715704 Posted on: 09/30/2019 12:28 PM
Take a look how nvidia 128bit bus cards are doing. 1650 is still slower than 570.
Who cares about bit bus nowadays though? My 390X has 512bit but it ain't better than 256bit RX580/590 due to old arch and lower clocks! So, 5600 could easily be a better choice than RX500 series despite half the bus.
Take a look how nvidia 128bit bus cards are doing. 1650 is still slower than 570.
moo100times
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#5715706 Posted on: 09/30/2019 12:49 PM
Let's see cost and performance before deciding if this is a good or bad move. AMD is out to defend their position in a price/performance context so I reckon (well, hope!) this is not a short sighted decision!
Let's see cost and performance before deciding if this is a good or bad move. AMD is out to defend their position in a price/performance context so I reckon (well, hope!) this is not a short sighted decision!
warlord
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#5715714 Posted on: 09/30/2019 01:26 PM
Sure there is a possibility of bottleneck, but we are talking about AMD not NVidia eh? Question is how strong will it be as a Navi. Will it be at RX560 class (128bit) refresh levels? Or it will be a pleasant surprise for the price range? We'll see.
I guess it is viable to have near RX 580 performance with half consumption, half bus width with RX 5600 XT and near RX 570 performance with half consumption and half bus width with RX 5600. It could be done, if it is done right I believe.
Take a look how nvidia 128bit bus cards are doing. 1650 is still slower than 570.
Sure there is a possibility of bottleneck, but we are talking about AMD not NVidia eh?
Question is how strong will it be as a Navi. Will it be at RX560 class (128bit) refresh levels? Or it will be a pleasant surprise for the price range? We'll see.I guess it is viable to have near RX 580 performance with half consumption, half bus width with RX 5600 XT and near RX 570 performance with half consumption and half bus width with RX 5600. It could be done, if it is done right I believe.
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#5716065 Posted on: 10/01/2019 11:56 AM
You completely ignored what I said and proceeded to ramble about your own opinion.
I care, and a friend of mine cares too. I'm certain allot more people knowing how it affects performance will care too.
Generally, bus is chosen according to performance of the GPU, VRam speed and price. If the cards bring faster GDDR6, I see why AMD wont extend the bus over 128 as it will probably have enough bandwidth for gaming.
But will the bus affect other software, like drawing and rendering CAD 3D etc, or will the bandwidth alone mater? And if they really cheap out and put normal GDDR5 on it, it's DOA for me.
Not everyone uses the cards just for gaming, for that AMD balances the card accordingly.
Who cares about bit bus nowadays though? My 390X has 512bit but it ain't better than 256bit RX580/590 due to old arch and lower clocks! So, 5600 could easily be a better choice than RX500 series despite half the bus.
You completely ignored what I said and proceeded to ramble about your own opinion.
I care, and a friend of mine cares too. I'm certain allot more people knowing how it affects performance will care too.
Generally, bus is chosen according to performance of the GPU, VRam speed and price. If the cards bring faster GDDR6, I see why AMD wont extend the bus over 128 as it will probably have enough bandwidth for gaming.
But will the bus affect other software, like drawing and rendering CAD 3D etc, or will the bandwidth alone mater? And if they really cheap out and put normal GDDR5 on it, it's DOA for me.
Not everyone uses the cards just for gaming, for that AMD balances the card accordingly.
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#5716085 Posted on: 10/01/2019 12:51 PM
If AMD is targeting a 75w TDP for the 5600 you have your answer for 128bit bus. No extra power connection means you just increased the number of OEM PC's you can easily put this card into by a metric ton.
If AMD is targeting a 75w TDP for the 5600 you have your answer for 128bit bus. No extra power connection means you just increased the number of OEM PC's you can easily put this card into by a metric ton.
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#5716087 Posted on: 10/01/2019 12:54 PM
At those specs and tdp it wont even match Polaris 10.
If AMD is targeting a 75w TDP for the 5600 you have your answer for 128bit bus. No extra power connection means you just increased the number of OEM PC's you can easily put this card into by a metric ton.
At those specs and tdp it wont even match Polaris 10.
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#5716091 Posted on: 10/01/2019 12:58 PM
Isn't it technically a replacement for the RX560? I don't know what variant of Polaris that's considered but it also has a 128bit bus and ~75w TDP. Presumably this card will have Navi's improved compression and faster memory clocks. So I don't see why it wouldn't at least beat the card it's supposed to replace?
At those specs and tdp it wont even beat Polaris 10.
Isn't it technically a replacement for the RX560? I don't know what variant of Polaris that's considered but it also has a 128bit bus and ~75w TDP. Presumably this card will have Navi's improved compression and faster memory clocks. So I don't see why it wouldn't at least beat the card it's supposed to replace?
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#5716093 Posted on: 10/01/2019 01:07 PM
Did 5700 replace 570? We cant compare it to 560 becouse it wont be priced as 560.
Isn't it technically a replacement for the RX560? I don't know what variant of Polaris that's considered but it also has a 128bit bus and ~75w TDP. Presumably this card will have Navi's improved compression and faster memory clocks. So I don't see why it wouldn't at least beat the card it's supposed to replace?
Did 5700 replace 570? We cant compare it to 560 becouse it wont be priced as 560.
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#5716181 Posted on: 10/01/2019 04:59 PM
In terms of performance RX 5500 will be like RX 560. So we can assume 5300 and 5500 goes OEM also. That bus will not be a bottleneck to RX 5600 series because they will be as powerful as RX 570/580. You can buy RX 570/580 anytime you want to not be afraid of width anyway, it is so cheap.
In terms of performance RX 5500 will be like RX 560. So we can assume 5300 and 5500 goes OEM also. That bus will not be a bottleneck to RX 5600 series because they will be as powerful as RX 570/580. You can buy RX 570/580 anytime you want to not be afraid of width anyway, it is so cheap.
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#5716205 Posted on: 10/01/2019 06:04 PM
75W (i.e: no additional PCI-E power connector) on a 5500/5600 desktop? that's never gonna be happen
75W (i.e: no additional PCI-E power connector) on a 5500/5600 desktop? that's never gonna be happen
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#5716210 Posted on: 10/01/2019 06:13 PM
I assumed it did because I feel like a normal company would try to maintain some kind of naming system but AMD's marketing team seems to defy normality.
Why not on a 5500? I initially said 5600 because I assumed it was replacing the RX560 - but a 5500? The RX 560 already has non-PCI-E power variants. Why wouldn't a 7nm, updated version not be able to do that?
Did 5700 replace 570? We cant compare it to 560 becouse it wont be priced as 560.
I assumed it did because I feel like a normal company would try to maintain some kind of naming system but AMD's marketing team seems to defy normality.
75W (i.e: no additional PCI-E power connector) on a 5500/5600 desktop? that's never gonna be happen
Why not on a 5500? I initially said 5600 because I assumed it was replacing the RX560 - but a 5500? The RX 560 already has non-PCI-E power variants. Why wouldn't a 7nm, updated version not be able to do that?
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More competition the better for the consumer.