AMD unleashes Radeon RX 6000 Series, promises RTX performance

[kalniel]

Is it because of money from Nvidia or are the people at Hexus being dumb? RTX and DXR are NOT the same. Its misleading and stupid to use the term RTX as it just reinforces Nvidia's attempts to control industry standards (just like Freesync/G-Sync).

Which people at Hexus say it's the same? By RTX performance in the article Hexus mean the AMD RX6000 series perform as fast as the NVidia RTX series. Why would that be because of money from Nvidia?

[Corky34]

I gather some graphics cards can map a window of 256MB, though I thought it was commonly a couple of 128MB windows. 256 bit would be a massive address range, we haven't gotten close to the limits of a 64 bit address range yet, and PCIe can only go up to 64 bit addressing.

From what I remember of the early PCI specs (and that was some quarter century ago and not the most memorable of documents ) it seemed like the original intention was to map all the memory of a card into the memory space of the CPU. OFC with 32 bit PCs still being around when graphics cards were getting to 1GB of ram the GPU vendors had to limit the mapped memory segment as it was using up enough address space as it was and giving us that lovely Windows XP limit (was it 3GB? As a Linux user I can't quite remember).

The bit that doesn't make sense to me here is that the Ryzen 3000 series and the Ryzen 5000 series are supposed to use the same IO controller die. So either AMD fibbed about re-using the controller die, or they can't be bothered to enable this feature in their old BIOS modules. The PCI configuration is a BIOS issue, so it does need motherboard support.

Between what Tabbykatze and yourself have said now I'm totally lost, the first thing i knew about the BAR was having a video GN did about this release on in the background so i defiantly wasn't paying much attention, i can hear my teacher now shouting out for the pupils at the back to pay more attention.

I think we've got a great big ball of wires though, i thought CCIX was for cache coherence between CPU's and an 'other' cache, something this (AFAICT) isn't because it seems to be about how much of the system RAM can be addressed at a time, and I'm not sure it's about what your talking about either DwU as you seem to be describing the address space that PCI(e) register themselves at and not the other register that PCI(e) uses when it's addressing data stored in RAM.

EDIT: You seem to be talking about the PCI configuration space whereas "Smart Access Memory" seems to relate to the reserved address space in RAM for when something needs to send data to the device.

[DanceswithUnix]

EDIT: You seem to be talking about the PCI configuration space whereas "Smart Access Memory" seems to relate to the reserved address space in RAM for when something needs to send data to the device.

This feature allows the CPU to just simply access the whole of the GPU memory as one simple linear lump, rather than having to go through small windows into the ram.

How you access the memory on any PCI(e) card is set up through the PCI configuration space, using the base address registers.

The thing I am confused about is that this shouldn't be hard. I assume the difficulty would be in some older BIOS implementations having expectations on how a video card is set up that it potentially breaks, so perhaps there is some finesse in the configuration for backwards compatibility. That might explain why they claim it only works on 500 series motherboards with 5000 series CPUs. That is odd, when 5000 series CPUs share an IO die with 3000 series, and the 4000 series APUs are more recent.

Edit: I've had a bit of a refresher recently reading about BAR registers in context of the raspberry pi compute module and people trying to get video cards working on the PCIe x1 interface of the breakout board. The first hurdle was the Pi configuration only allowed a piddly 64MB of address space to be mapped by the PCIe card. Seems they've got past that now, and into other problems. Wonder if their hacks will be good enough to map a 16GB vram, though I suspect a 6800 GPU might be a tad bottlenecked by that arm SOC

[CAT-THE-FIFTH]

AMD has supplied some benchmarks:
https://www.amd.com/en/gaming/graphi...ing-benchmarks

[Gentle Viking]

Yeah saw those a few hours ago, if they hold water then team red are back in the game.

I do like in forza 4 1440p even the bottom 6800 kick 3090 ass

[Tabbykatze]

AMD has supplied some benchmarks:
https://www.amd.com/en/gaming/graphi...ing-benchmarks

I very much like this method of presenting their internal benchmark data, it's very transparent and verifiable.

[Primey0]

Straight $=£, so £650 and £1,000 (plus gouging and scalping, as per the NV lineup)

I highly doubt that.

[bowepa]

For me Nvidia is for RTX and always will be .