vibbelito
-
Posts
30 -
Joined
-
Last visited
vibbelito's Achievements
-
Just thought that I should add that according to my motherboard box it does support crossfire. But that may well be because back then the crossfire wasn't communicating purely over the PCIe link. And instead used a separate crossfire bridge.
-
After hooking up the 40$ dell optiplex 9020 with an i7-4790 and 24gb ram. I connected the two Vega 56, one to a PCIe 3.0 x16 and the second to a x16 slot running at x4 speeds the flickering have now been reduced to specific textures for some reason. I run the exact same SSD that was in the FX-8350 system and the exact same drivers so the problem must be that the FX-8350 platform wasn't up to the task
-
Except for normal gaming and some video editing I also plan to run Valve index VR on the system if that makes any difference. I am also for fun considering a motherboard that allows for Quad-Crossfirex to run 4 of those power hungry Vega 56 GPUs' but I don't think scaling would be particularly good beyond 2 of them. ??
-
This seems to check out so now the decision lies in deciding between going for intel platform (i7-9700k/ i9-9900k) or AMD platform (ryzen 7 3700x / ryzen 9 3900x) considering I do sometimes do some photo and video editing. The FX-8350 was fine but it always left me craving for more raw cpu power when editing/rendering. Anyway the decision will probably boil down to what PCIe generation and speed I will ultimately need to never ever having to see this god awful headec causing flashing. I think the intel motherboards offer up to dual PCIe gen 3 x16 slots without slowing them down. But AMD has PCIe gen 4 on the latest motherboards and gen 3 on the older ones but I can't seem to find anyone with dual PCIe 3.0 x16 slots. It always seem to be that one either runs at x8 speed all the time or that if both slots are used, that they both run at x8 speeds. What should I go for then to allow these cards to run at full potential taking everything in consideration. And yes I might upgrade that 850w psu as well then to allow for some overclocking and not having it run at the peak of what it's capable of.
-
Well I put up a nice little test bench based on the Dell optiplex 790 motherboard with an i7-2600 and 8gb RAM. And running everything of an 120gb ssd with a fresh install of windows 10. I started out with an AMD radeon HD5870 to compare performance increase and bottlenecking, ran some benchmarks and moved on to an AMD Radeon HD7970, installed the latest drivers and ran the same benchmarks and saw pretty much a doubling in performance. Then when I moved on to the Vega 56 where the first card crashed on boot so I switched to the other one which booted after some tries. But everything was running extremely sluggish and for some reason the pc was taxing the GPU 100% most of the times while idling. So I downloaded and installed the latest drivers which actually was the same as the ones for the 7970. But the problem persisted and the screen went black a few times. I then preceded with trying the benchmark again but it crashed on the lowest 720p settings. (Yes I play Half-Life 2 on this pc, don't you need dual Vega56 for that?) So for some reason this old pc can't handle this newish GPU due to something being incompatible. So I guess well have to wait until I get something newer to see if we can get to the bottom of exactly what's causing the flickering.
-
Well do you have any suggestion on what the lowest tier AMD CPU is that wouldn't be able to bottleneck dual Vega cards then? Thinking about getting a ryzen ryzen 9 3900x or possibly a ryzen 9 3950x if that isn't way to overkill for crossfired Vega 56.
-
Running the superposition benchmark at 8k crashes the PC for some reason.
-
It's a Dell OptiPlex 790 Mini-Tower and it seems like it also uses one 16x slot and one 16x slot wired up as a 4x slot whilst being PCIe gen 2 See attached pdf optiplex-790_owner's manual_en-us.pdf
-
You are probably correct in that these fast cards aren't able to communicate fast enough with each other over that PCIe gen 2 x4 slot. I have ran a few tests wit the superposition benchmark and by the looks of it the flashing is much less visible when running a 720p test and when running a 4k test the screen is more black than anything else which to me indicates that it isn't able to synchronize the frames between the two cards. I will do one final test today and that is to swap out the FX-8350 and MB with an i7-2600 with DELL oem MB. Which I guess also only have a x4 slot. But it's worth a try.
-
I have also tried to power my second gpu via an external 500W psu with the same results so I now know my psu can't be to blame. I have also tried to move the pc to a different circuit of the house and connecting it to a normal Dell monitor over display port with the exact same result.
-
Okay so according to my power meter consumption at idle was about 115W and I couldn't get it to draw more than 380W through the meter for some reason Running RDR2 on only one gpu and whilst powered through the meter GTA V saw even more and longer blackouts and unresponsiveness which is weird. It's like the pc isn't able to draw enough current through the wall and therefore almost crashing the game when trying to draw more than around 350w on about 40-60% load. Then cpu and gpu utilization dropped down to barely anything and screen going black for a second and then coming back.
-
Nah that PSU is currently installed in my brother's pc that's also running an FX8350 and a R9 390 gpu. All other hardware I have lying around is pretty much worthless today except maybe a Dell optiplex with an i5-2500 that currently sits unused. But not really worth the hassle trying to sell the things. What sold me on dual Vega 56 was this video showing them destroying an RTX 2070 And since that when they are overclocked basically becomes a vega 64. And crossfire vega 64 mostly come out ahead of a single RTX 2080ti in most games tested in this video So this is why I would want this setup to really work and not be all flashing like this.
-
This made me crack up a little since I do know it's a really unbalanced rig and the whole thing is rather silly and me to would enjoy seeing this thing covered on a reputable YouTube channel. ? Anyway I built this pc back in 2014/2015 and was paired up with a radeon HD7970. That was passed down to me since I was still in school back then = no money. So I now decided to start upgrading the bloody thing and started with new gpu which I felt would make the largest impact (which it did, almost double performance by a single card) and based on that I would evaluate how much of a bottleneck the ancient FX cpu is mostly for fun while I'm waiting for the i7-4770 rig to arrive which costed me 40usd including 16gb ram and a 250gb ssd . And if that still isn't enough I will start looking at building a ryzen 9 3950x setup which surely won't bottleneck any gpu for a few years to come.
-
It probably doesn't. I have aslo Access to a FSP 650-80EGN 650W psu. But that would probably not have enough power.
-
The hp xw8600 has dual 16x 2.0 ports so I could try the cards in that ones I get it. Althoug that pc with dual 4 core xenon processors would bottleneck the cards even more.
