What is the best graphics card for a pci-e 3.0 x8 slot?

[Kevin11]

purely for aesthetics and because I won't be spending $1,000 on a graphics card for a few more years, I am using my 2nd slot instead of my first, which is a pci-e 3.0 x8 slot. If I were going to upgrade my graphics card what is the highest I would want to go? Would say a GTX 980 or 1070 bottleneck at all on a 3.0 x8 slot?

[Fungal]

nothing bottlenecks on that it'll run fine

[Godlygamer23]

You'd be fine even with a Titan X[P].

[SLAYR]

They won't bottleneck, but it has to be a pcie x16 slot physically for the cards to fit, electrically it can be x8.

[rn8686]

Nothing bottlenecks PCI-E 2.0 slots yet, you will be fine. 

[Kevin11]

3 minutes ago, Godlygamer23 said:

You'd be fine even with a Titan X[P].

 

3 minutes ago, SLAYR said:

They won't bottleneck, but it has to be a pcie x16 slot physically for the cards to fit, electrically it can be x8.

 

2 minutes ago, rn8686 said:

Nothing bottlenecks PCI-E 2.0 slots yet, you will be fine. 

 

This seems crazy to me, so there is literally no reason for a 3.0 x16 to exist yet? there is no instance where a 3.0 x16 would ever be needed over a 3.0 x8?

[Godlygamer23]

Just now, Kevin11 said:

This seems crazy to me, so there is literally no reason for a 3.0 x16 to exist yet? there is no instance where a 3.0 x16 would ever be needed over a 3.0 x8?

At this point, no. 

[SLAYR]

4 minutes ago, Kevin11 said:

 

 

 

This seems crazy to me, so there is literally no reason for a 3.0 x16 to exist yet? there is no instance where a 3.0 x16 would ever be needed over a 3.0 x8?

Really it is just for backwards compatability, and because pretty much all because almost all gpus are x16, and also so that future devices like pcie ssds have the ability to use the whole capability of 3.0x16 if someone creates a fast enough one.

[Electronics Wizardy]

5 minutes ago, Kevin11 said:

 

 

 

This seems crazy to me, so there is literally no reason for a 3.0 x16 to exist yet? there is no instance where a 3.0 x16 would ever be needed over a 3.0 x8?

100gbe.

 

You can't run  a dual 100gbe all full bandwidth.

 

pcie is ~160gb/s

[Moderateshadow]

youre file in an 8x.

 

on that note lol@ pci-e 4.0

[Glenwing]

35 minutes ago, Kevin11 said:

This seems crazy to me, so there is literally no reason for a 3.0 x16 to exist yet? there is no instance where a 3.0 x16 would ever be needed over a 3.0 x8?

It's for things besides gaming. Games aren't heavy on PCI Express bandwidth, they don't need very much. Other applications, like high intensity compute, do need a lot. In fact that is why supercomputers are looking for replacements to PCIe 3.0 like NVLink, because PCIe 3.0 ×16 does not provide enough bandwidth. But for gaming, even PCIe 3.0 ×4 is enough.

[Zyndo]

39 minutes ago, Kevin11 said:

This seems crazy to me, so there is literally no reason for a 3.0 x16 to exist yet? there is no instance where a 3.0 x16 would ever be needed over a 3.0 x8?

As said by @Glenwing, but I shall reinforce what he said. When it comes to gaming you can't come even close to the amount of information needed to bottleneck on PCIe lanes. when gaming the CPU and GPU do a lot of work individually, but the actual amount of communication between them (this is when the lanes would be utilized) is quite small in comparison to other high end application types.