how to crossfire

[Masimeke]

i got two strix radeon rx570. i don't know how to crossfire. please help

[Guest]

First, check if your motherboard supports it.

[GoldenLag]

you ideally dont. crossfire, like SLI is just a waste, and ultimately reduce performance. 

 

 

but if you really want to do it, check if the mobo supports it and then enable it in Radeon Software. 

 

 

ideally you just sell both and get a vega instead. 

[Masimeke]

 

1 minute ago, GoldenLag said:

you ideally dont. crossfire, like SLI is just a waste, and ultimately reduce performance. 

 

 

but if you really want to do it, check if the mobo supports it and then enable it in Radeon Software. 

 

 

ideally you just sell both and get a vega instead. 

im in fiji so i cant sell them because there is not a big market for that and i can buy any gpus hear

[Masimeke]

4 minutes ago, GoldenLag said:

you ideally dont. crossfire, like SLI is just a waste, and ultimately reduce performance. 

 

 

but if you really want to do it, check if the mobo supports it and then enable it in Radeon Software. 

 

 

ideally you just sell both and get a vega instead. 

but thanks for the help

[GoldenLag]

Just now, Masimeke said:

 

im in fiji so i cant sell them because there is not a big market for that and i can buy any gpus hear

why do you have 2 cards then? do you have an option to return one of them? because dualcards are more trouble than its worth, unless you play one of the few games that support it and nothing else. 

[Masimeke]

no i cant return them i got them from an anty that was giving away a bunch of stuff

[mariushm]

Crossfire will work easily on AMD.

I think the requirement is that video card must be plugged in a pci-e x4 minimum. Ideally you use a motherboard with 2 pci-e x16 slots which auto convert to 2 x8 slots when 2 video cards are inserted.

Some mb have a pci-e x16 slot (usually near the bottom of the board) which is x16 as size but it only has the wires to be maximum x4 electrically.

 

if these conditions are met, you can go in radeon settings and enable crossfire

 

gaming > global settings > (select video card if needed) > AMD Crossfire : set to ON

 

Note some games ignore and will use one card only

for some games you may have profiles you can download or select

if your 2nd card is in pci-e x4 slot, it may slow down both cards as communication between cards has to go through chipset

vga -(2-4 GB/s) - chipset -(3-4GB/s)- cpu - (8-16GB/s) - vga  instead of

vga - (4-8GB/s) - cpu - (4-8GB/s) - vga

 

it's 2 numbers because pci-e 2.0 has 500MB/s per lane and pci-e 3 has ~970 MB/s per lane

RX 570 knows pci-e 3.0 but some boards with older chipsets will only do pci-e 2.0 and pci-e slots created by chipset are usually pci-e 2.0 max

 

so

pci-e x4 : 2GB for 2.0, ~ 4GB for 3.0

pci-e x8 : 4GB for 2.0, ~ 8GB for 3.0

pci-e x16 : 8GB for 2.0, ~ 16GB for 3.0