PC system impacts from tech like UE5? [Storage, RAM] *spawn*
- Thread starter MistaPi
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Unknown Soldier
Veteran
Isn't it 6x on PS5. Cerny called it "Priorities" though but I think he means lanes. Current gen top SSD's use 4xPCIe lanes as you mentioned, the PS5 uses a bit more because they can.
Something you forgetting here though. If they are using compression, 9GB/s would be required. Then there's the driver and OS/filesystem overheads. Even current gen SSD's that are 5GB/s, real world results show actual speeds of 4GB/s or less depending on SSD/controller used/heat etc.
Tim did say the Intel NVMe Optane SSD's as the closest SSD's to the PS5 this gen. I would take it RAID NVMe SSD's would also have enough bandwidth to match the PS5, but that's going to extreme cost wise on the PC.
Unknown Soldier
Veteran
Ok, I went to look at the video again. He doesn't talk about the lanes. He does however talk about the priority levels. He says current gen and seems to imply current 7GB/s gen SSD's only use 2 priority levels where as the PS5 uses 6 priority levels.
I listened to the conversation where epic said that it would run on a modern PC.
Yeah these are different things. Although Cerny says NVMe currently supports 2 priority levels, everything I've read says it supports 3 (High, Medium, Low), I've also seen reference to a 4th which is urgent. In any case the PS5 supports more which presumably makes things a little more efficient. Both PC and PS5 (and XSX) use PCIe 4.0 4x interfaces from the SSD to the rest of the system though which maxes out around 7.5GB/s. The difference is that the PS5 compresses more of the data it sends over that interface than a PC would so it can increase the effective bandwidth to 8-9GB/s. PC drives will be pushing 7GB/s uncompressed (vs PS5 5.5GB/s) by the end of this year, but it's not clear to me how much extra effective bandwidth PC's would get from compression, if any. And that extra bandwidth would have a trade off in CPU cycles which the PS5 doesn't have to contend with thanks to the hardware decompressor.
The PS5 has lot's of other enhancements to help out the data flow though, some of which may be solved/matched by DirectStorage and technologies like HBCC and some which certainly won't.
Optane is currently slower than standard NVMe Gen4 drives in pure throughput but has a massive advantage in latency. Gen4 Optane drives should equalize things in terms of throughput and I'd expect to see those within the coming months. An Optane SSD would have far lower latency than the PS5 SSD, but the rest of the data path from SSD to memory would have far lower latency in the PS5 than (current) PC's.
Unknown Soldier
Veteran
haha, I said as much in the Unreal thread.
https://forum.beyond3d.com/posts/2127122/
Yeah, not following Optane but Sweeney did mention that Optane was better, and now I take it he was actually talking about the latency as you mentioned. Good to know.
*editted* to fix all the quotes and my forum post.
Can AMD start to release an APU with a similar I/O design as in the PS5?
Is there legal barrier for AMD to release an APU with 64CUs RDNA3, 12-core Zen3, 32GB HBM3, with a soup up PS5 I/O in 5nm process in 2022?
Can APU be the future of PC?
Don't see the need for that anywhere.
John Norum
Newcomer
for desktop pc no, for tablets, yes, for laptops, maybe
D
Deleted member 7537
Guest
AMD did release some APUs for desktop called the A-Series. Right now the closest you'll find are CPU with integrated graphics.
https://www.amd.com/en/products/apu/7th-gen-a12-9800e-apu
The reason AMD will (probably) never release a APU similar to what PS5 has is that most people that are interested in high end graphics, are those who usually upgrade their components frequently. An APU limits your flexbility if you want to upgrade in the future. If I'm not mistaken you could pair some AMD APUs with another dedicated GPU but the support was very poor.
Attachments
I think they exist, APU's atleast, in the desktop. But they rarely are for anything serious gaming.
John Norum
Newcomer
of course they exist, but he is asking if those are the future of PC's. Of course they are not. PC have a lot of space to cool down components, no need to put GPU and CPU togheter
https://wccftech.com/intel-optane-g...d-for-up-to-50-faster-gaming-performance/amp/
No idea if this was shared on 01 april here
No idea if this was shared on 01 april here
Orion
Regular
Was it just one press conference? or did they speak with multiple outlets independently?
A modern pc could be with or without sata. Their claim was that epic noted not even sata ssd could suffice.
As I understand it, it was an open* remote meeting. Multiple outlets reported on it, each with their own take-aways it seems.
* Journalists only. Wasn't public.
Yeah that was precisely how it was - I listened to a recording of the meeting that DF and other outlets had representatives at! IIRC it was the PC Gamer representative who asked questions about the nature of the PC (RTX 2070 was the example used) that could run it.
Is it two buses though? These are the 24 PCIe lanes on the Zen2 chip itself. They are simply split as 16 for the GPU, 4 for the NVMe SSD and 4 for the rest of the chipset. So surely these would all be controlled by a single driver, especially as the split of the 20 non-chipset lanes isn't fixed.
My understanding is that the ability to use the SSD (as well as network storage) as an extension of the GPU's virtual memory address space is more targeted at the server market than the gaming market, at least at the point when Vega was launched anyway. It may also be the case that AMD were aware of the console IO design at that point and wanted to ensure it's PC gaming parts could leverage the same capability when the time was right. Certainly at the moment the capability would be essentially useless as a gaming feature, it didn't really add anything when extending the memory space to system memory, never mind past that into NV memory because the software isn't designed to take advantage of it. But software designed around that paradigm coupled with potential improvements to the whole IO stack that Microsoft may be bringing with DirectStorage could potentially change all that.
It's also worth considering that the Radeon Pro SSG already sets a precedent for this in the PC space, i.e. the GPU communicating directly with an SSD (actually multiple SSD's in a RAID configuration). However I've no idea whether they were controlled by the graphics driver or their own driver given the SSD was attached to the GPU itself rather than being on the other side of a PCIe bus.
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