AMD RDNA3 Specifications Discussion Thread

trinibwoy said:
355w is not enough to hit target clocks?
Click to expand...
Certainly possible if there's hw/timing bug(s) affecting the V/f curve. If they are going for a re-tapeout it probably means they've isolated and fixed at least the most egregious ones.

It sucks but given that the industry is going through a demand trough (and Radeon's MSS is low anyway) the impact is probably not as bad as it could have been. Plus it looks like even the buggy chips are decent enough make lemonade, especially given the price headroom Nvidia has graciously given them to play with.

Very interested to see how the fixed V/f curve lines up vs. NVidia's now that they are in the same process node.
 
neckthrough said:
Very interested to see how the fixed V/f curve lines up vs. NVidia's now that they are in the same process node.
Click to expand...
While all "5nm" and "4nm" are same node, there are pretty big differences between different variants and sadly we have no details on the process NV uses because they insist on using custom name for it too (all big players get to customize the process to some extent for their needs)
 
Just based on the current leaked information this doesn't seem that straight forward.

From the leaked benchmarks there's seemingly some scaling limitations and inconsistency from the 7900XT to 7900XTX. On paper the 7900XTX has roughly 15% more "hardware" and also a 15% higher power limit. If it's just a power issue as traditionally understood due issues with frequency/voltage that doesn't seem like it would explain what is happening here.

We'll need to see how things actually shake up once more information turns up at launch and post, but I'd wonder at this point if there is tradeoff/limitation/etc. to do with the chiplet design.
 
Kaotik said:
there are pretty big differences between different variants
Click to expand...
Nah, not really, N5 variants are very samey.
Unlike say, N3 and N3e which are basically two entirely different nodes altogether.
neckthrough said:
the impact is probably not as bad
Click to expand...
The channel normalized earlier than expected at least according to Gigabyte so it kinda stings, but AMD's non-quite-so-fucked mainstream options aren't far off so it's not all doom and gloom either.
arandomguy said:
but I'd wonder at this point if there is tradeoff/limitation/etc. to do with the chiplet design.
Click to expand...
The tradeoff is that you spend more watts moving stuff off-chip, add some (relatively minor) packaging costs and some extra validation steps.
 
But i cant belave that power is issue. They could go easyl 500W and nobody will care for high end. so why not go 500w with good aio cooling and get the 3ghz?

Also intresting even 4090 running in an power limit. If you recude the power on 4090 massily you don't get much losses in fps. Mabe issue with 5nm process?
 
Digidi said:
But i cant belave that power is issue. They could go easyl 500W and nobody will care for high end. so why not go 500w with good aio cooling and get the 3ghz?

Also intresting even 4090 running in an power limit. If you recude the power on 4090 massily you don't get much losses in fps. Mabe issue with 5nm process?
Click to expand...

Well if its true and they are goign to go for a respin with bug fixes why blow your load on a crazy power hungry card when you can swim in the $1000 end of the pool and have a bigger splash when the higher clocked fixed part comes out ?
 
You must log in or register to reply here.

Similar threads

A
RDNA3 Efficiency [Spinoff from RDNA4]
3 4 5
Replies
85
Views
10K
Bondrewd
Bondrewd
F
AMD RDNA5 Architecture Speculation
2 3
Replies
50
Views
9K
Bondrewd
Bondrewd
Cyan
AMD Execution Thread [2025]
2 3
Replies
45
Views
5K
trinibwoy
T
D
Performance scaling on big GPUs discussion ...
Replies
15
Views
2K
Rys
Rys
Rys
  • Locked
  • Sticky
Architecture and Products - Subforum Guidelines
Replies
0
Views
2K
Rys
Rys
Back
Top