Tech preview: Radeon RX 5700 (379 USD) and 5700 XT (449 USD)

by Hilbert Hagedoorn on: 06/11/2019 01:20 AM | source: | 196 comment(s)

AMD just has announced its Radeon 5700 series graphics cards. The NAVI, 7nm, GDDR6 memory and a new architecture called rDNA. In this early preview article, we’ll share details and about the technology and specifications. This by no means is a review, the actual launch review you may expect in early July.

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Fox2232
Senior Member

Posts: 11809
Joined: 2012-07-20

#5687948 Posted on: 07/06/2019 07:17 PM

@Fox2232 do you know if RDNA has a CU limit like GCN did?

It should not. I think that it is reason why RDNA on macro building level looks like it is GCN partly turned inside out. But I can't remember it being written on any slide or supporting text.

64CU limit was end of the road for AMD since Fiji. Since that point AMD could only go for clock and beefed up CUs. Doing that again would be end of their GPU division and claims that they are going to deliver/compete with enthusiast GPUs again would be false.
(Or rather those GPUs would be limited to mainstream performance for some time and then to entry level.)

They may have one of following approaches:
- Current Shader Engine has 10x Dual-CU (1280SP)
- > This can be either duplicated (more Shader Engines) or count of Dual-CUs per SE may go up
- > Duplicating entire SE may have some issues with access to parts that are needed but are in center of GPU (ACEs, Geometry Processor, ...), but that's just speculation on my side as bandwidth required may be actually pretty small
- Each SE caries rasterization and L1, those can be beefed in case more CUs are used per SE too

I honestly think that every weakness I may come with may prove to be overcome just by Infinity Fabric on which AMD made big bet and it seems to pay off in CPUs.

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