RTX 3080, Thunderbolt 3, and Throughput Saturation?
Yeah it's going to be months to be able to buy it.
I would buy one of the new AMD gpus that come next month but I am so scared about having to fight with the bootcamp to get it working there. I would actually prefer AMD because of the Mac OS support but hopefully the Windows AMD egpu support improves...
I was looking at both the 3080 FE and the 3070 FE. The 3080 looks to be out of the scope of the Standard XG Station Pro as with an advertised 320w I think it will be at the limit. Unless Asus release the official 'Y' power adapter so owners can sling another 330w adapter...
So the 220w 3070 FE is where my thought is right now. I just need to take the time to check if it will fit (2.7 slot size)
So anyone planning on this combination let me know. I was looking at the Asus branded cards but they seem to be 2.9 slot sizes.
@james_knight, that's a good point I hadn't even considered the physicial dimensions of the XGS Pro.
It does seem possible to power limit the 3080. Some reviews did this to compare the 3080 and previous cards at 270w, and I think the performance difference between 320w and 270w was minimal.
It might also be the case that the 3080 will not really be able to get to max power draw because of TB3 limitations anyway, in gaming scenarios at least.
Either way I'm looking forward to see what the performance is in like in any eGPU setup.
The annoying part is if you contact Asus they say they have stated that the 2080 is compatible. Yet they have multiple variations, some extreme OC edditions that not only draw more power than I think could be handled but the heatsinks take them up to 2.9 slot sizes.
So I am personally going to get the ruler out, and consider the FE 3070 as it states it is a 2.7 slot size (EDITED | Nvidia's Website states 2 slot size for both 3070 & 3080 FE I think the figure I got was from Asus ROG 3070 & 3080 gaming editions.), but I am a stickler for having match branding. So if I could get a 3070 ROG from Asus I would prefer too.
It's not an eGPU or thunderbolt test, but TechPowerUp released a PCIe scaling test for the RTX 3080. Their numbers for PCIe x16 1.1 should be similar in bandwidth to an PCIe 3.0 x4 direct connection. As we know, thunderbolt has other performance limitations so more specific eGPU testing is needed. That said, we're looking at 90% of full desktop performance at 4k and 87% of full desktop performance at 1080p. They note in the conclusion that they were CPU bottlenecked in some games at 1080p so the margin could actually be higher at 1080p.
@nu_ninja, Yeah, I suspect that CPU bottleneck will play a part with laptops, and also it does seem the TB3 protocol is more of a hurdle than raw bandwidth. m.2 setups should work pretty well.
Was obscenely lucky to just receive confirmation I somehow managed to obtain an MSI Ventus 3080 after 2 hours of frantic refreshing the checkout window of a constantly crashing site over here in Oz. Should receive the card early next week, I'll let you know how it performs in my Core X.