Upgrade from PCIe 3.0 to 4.0 for RTX 3080

[Kasenumi]

Hello guys
It is less than two weeks until we shall see the new RTX graphics cards (in our PC cases). Time for an upgade and getting ready for new games.
The question I want to ask is about upgrading a MOBO for RTX 2080. My current AB350 Gaming 3 motherboard handles RTX 2080, Ryzen 7 2700x and 16 GB 3000 Mhz RAM (that has to run in 3200 but that speed causes BSOD, 3000 Mhz is stable, probably because of MOBO).
I am being adviced by my friend to upgrade my B350 MOBO to X570 for improved performance of both RAM, GPU. My friend keeps telling me it's a big upgrade in terms of performance. 
Would it really be a significant upgrade for 1440p gaming? Or is it better to wait for DDR5 to replace my B350 MOBO?

[Haro]

No. gen 3 x16 for the most part should be enough bandwidth for a 3080, wait for ampere to actually launch and check but for the most part it should be fine.

and the 2700x at higher resolutions shouldn't struggle at least that bad with a 3080, but again, wait and check. 

and either way the 2700x is gen 3 lol.

 

10 hours ago, CircleTech said:

Nvidia GPUs have never used more than PCIe 3.0x4

x4?? they saturated x8 easily, just not x16.

Edited September 7, 2020 by TofuHaroto

[BTGbullseye]

You'll also need to get a Ryzen 3000 CPU in order to get PCIe 4.0.

 

I'd suggest a B550 motherboard instead of an X570. It's less expensive, and gives you all the features.

[Moonzy]

3 minutes ago, Kasenumi said:

My friend keeps telling me it's a big upgrade in terms of performance. 

no

 

your CPU doesnt support pcie 4.0 to begin with

[BTGbullseye]

Just now, CircleTech said:

Nvidia GPUs have never used more than PCIe 3.0x4 bandwidth anyway so there should be nothing to roaay about. 

That is flat out false. The 2080TI was bottlenecked by a 3.0 x8 connection.

[Moonzy]

3 minutes ago, CircleTech said:

Nvidia GPUs have never used more than PCIe 3.0x4 bandwidth

pretty sure they do, even a 2060super does i think

[Haro]

10 hours ago, CircleTech said:

I keep thinking the GTX 900 series was only released a couple of years ago

Maxwell is quite old at this point.

[Stahlmann]

NVIDIA already confirmed that the PCIe 4.0 connection of the GPU will not perform any worse on PCIe 3.0. Also they did all their tests on a 10900K system, which only supports PCIe 3.0 to begin with.

[BTGbullseye]

1 minute ago, TofuHaroto said:

Maxwell is quite old at this point.

6 years.

[BTGbullseye]

Just now, Stahlmann98 said:

NVIDIA already confirmed that the PCIe 4.0 connection of the GPU will not perform any worse on PCIe 3.0.

No, they didn't. They said that CPU choice typically affects it more than PCIe generation, which is not the same thing. PCIe 3.0 on a Ryzen may result in 5% performance drops compared to 4.0, but we don't know yet.

[19_blackie_73]

Just to bring into context, the benchmarks nvidia showed were all on a 10900k that doesnt even support PCIe 4.0. the real thing holding you back in gaming performance compared to the 10900k is the cpu, not the pcie gen.

[Chris Pratt]

40 minutes ago, Stahlmann98 said:

NVIDIA already confirmed that the PCIe 4.0 connection of the GPU will not perform any worse on PCIe 3.0. Also they did all their tests on a 10900K system, which only supports PCIe 3.0 to begin with.

That doesn't mean it won't do better on PCIe 4.0, though. Nvidia is in a really tough spot. They need to sell these cards to Intel owners, because up until this point Intel has always had an edge in gaming performance, so there's a lot of hardcore gamers (i.e. the exact people that will be rushing out on launch day to scoop these cards up) on Intel. However, Intel doesn't support PCIe 4.0, and still probably won't for a year or two.

 

If I was Nvidia, that's exactly how I would have played it. Bench it on an Intel, as a worst case scenario. Then, if the AMD folks with their shiny PCIe 4.0 get even better performance, great, but that's a lot better than advertising performance that Intel users can't get, and then having unhappy customers because they can't get that performance you promised.

 

That doesn't mean 4.0 will actually do any better. I'm just saying that the fact that Nvidia demoed on Intel doesn't say anything definite. That was the smart move, either way.

[Stahlmann]

3 minutes ago, Chris Pratt said:

 

Who knows, maybe it'll all change once NVIDIA I/O will come into play and use the PCIe 4.0 bandwidth. Of course this will only be a factor if it's then paired with a PCIe 4.0 SSD aswell. A lot of interesting benchmarks coming up!  

[Chris Pratt]

1 minute ago, Stahlmann98 said:

Who knows, maybe it'll all change once NVIDIA I/O will come into play and use the PCIe 4.0 bandwidth. Of course this will only be a factor if it's then paired with a PCIe 4.0 SSD aswell. A lot of interesting benchmarks coming up!  

Oh yeah. I think I'm more excited about that than the actual cards themselves. Lots of good incoming content.

[Stahlmann]

58 minutes ago, Chris Pratt said:

Oh yeah. I think I'm more excited about that than the actual cards themselves. Lots of good incoming content.

For me the most exciting part is de-bottlenecking my TV. With HDMI 2.1 and the extra performance i can finally run my OLED TV at 4K 120Hz with 12-bit colors and HDR all at the same time. Right now i have to use either 4K 60Hz 8-bit or 1440p 120Hz 8-bit and neither is ideal. Not to mention i can actually play 4K at 60 fps and above

[carreragt]

As some others said all benchmarks shown by Nvidia were in pci e 3.0. They would have used a pci e 4 system if it bestowed more performance. In the reddit ama Nvidia clearly stated that the improvement with pci e 4 was very minor with only a few percentage points. Regarding pcie x4 vs x8 hardware unboxed has done a video dealing in exactly this. Their findings showed that pci e 3.0 x4 was indeed a bottleneck for nividia cards. But pci e 3.0 x8 and above doesn't make a difference.