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Would a 5070 be likely to saturate pci-e 4x16 with 1440p 120fps?

eddiew

eddiew

eddiew

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As per title really! I'm wrapped up in the E vs not-E AM5 motherboard conundrum. I'm not deeply budget constrained, but I'd prefer to stay under £400, and sad as it is I favour white/silver because I've got a white Fractal North waiting for something to go in it. This kind of leaves me with an Asus X670E-A or an MSI 650 Edge. I'm not enormously enamoured by Asus' recent behaviour, but I'm unsure as to how future proof a basic B650 is.

I don't gravitate towards games with major graphical intensity and high fps demands, and I've no desire for 4k on the desktop, let alone in games. I am considering an upgrade for Kerbal Space Program 2, which is currently recommending a 3080 (and therefore 4070?), but I can't at this time see anything more demanding on the horizon. Really I want a spanking good CPU and lots of ram for Cities Skylines, and that's not part of this equation.

I'd like my AM5 system to last a good 5 years, with a CPU swap in the middle of that; so my ponderment is whether it is likely that next-gen xx70 cards will be practically capable of saturating a regular 4.0 x16 slot, within that sort of timeframe. With a hypothetical 5070 or 6070, is it possible for 1440p gaming at let's say 120 fps to need that bandwidth?

(Edit: new icon for 2500 posts? :eek:)
 
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www.techpowerup.com

NVIDIA GeForce RTX 4090 PCI-Express Scaling

The new NVIDIA GeForce RTX 4090 is a graphics card powerhouse, but what happens when you run it on a PCI-Express 4.0 x8 bus? In our mini-review we've also tested various PCI-Express 3.0, 2.0 and 1.1 configs to get a feel for how FPS scales with bandwidth.
www.techpowerup.com www.techpowerup.com

Obviously we don't know what the 5070 will be yet, although I think it's safe to say it's unlikely to be higher performing than 4090! (There is the outside risk that they reduce it to 8x or something!)
Based on that I'd say you should be fine...PCIe3x16=PCIe4x8 more or less, so at worse you'll maybe lose 5%

KSP2 is also high on my list, but based on what I've seen performance is currently shocking! Even a 4090 won't keep up once the parts count increases...We can only hope they're able to improve it as time goes on (Matt Lowne on YouTube is, I think, using a 4090 and performance is still tanking). I'd go as high up the CPU stack as you can bare, as I think KSP1 scaled well with core count in it's later years (or get a placeholder CPU for now as it won't be a dealbreaker, then go 12 or more core next gen!)

(P.S. congrats on the 2500, working my way back up to Ray Liotta status :cool::cry: )
 
eddiew said:
This kind of leaves me with an Asus X670E-A or an MSI 650 Edge
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The edge does at least have a PCI-E 5.0 M.2 slot, so you'd hedge your bets there.

Personally I don't think it'll ever matter unless you buy a low-end card, on a par with the 6400/6500 XT (which only have 4 lanes each).
 
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I wouldn't get a PCI-E 4.0 AM5 motherboard unless it was closer to £100.The problem is what if Nvidia makes the RTX5070 a PCI-E 5.0 8X dGPU? The RTX4060TI is a PCI-E 4.0 8X dGPU.
 
It's worth mentioning that I ended up ordering an X670E today, which obviously has pcie 5. Partly because the B650 I was considering was out of stock and I already waited 5 months to build in a Fractal North :P

CAT-THE-FIFTH said:
The problem is what if Nvidia makes the RTX5070 a PCI-E 5.0 8X dGPU?
Click to expand...

But answers like this keep me interested in the question anyway :D
 
TrojanWhore said:
Either way though, @eddiew has gone for a PCIe5 board, so any risk is mitigated :)
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This was certainly a part of my reasoning. I can't be arsed finding out that I'm pcie limited in 4 years time even though I could potentially stick a 9800X38 into the board.

(That said, I was accidentally running my 3060 on pcie 3.0 x8 for a while without noticing. Turns out putting my soundcard in the big slot at the bottom of the board stole lanes from the top. I do feel like there was an improvement in smoothness when I sorted it out, but that might be confirmation bias in action.)
 
Yeah I'm in a similar boat (at least once I finish troubleshooting), 5950x but limited to gen3 cos of my board, still better than having to buy a new board though and it's enough performance for me :)
 
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