Riser on pcie x16 dont let me overclock (very low hash rate)

[Metroiid]

Hello everyone, i have a mobo with 4 pcie x1 and 2 pcie x16, i tried to connect my 5 RX 480, but if i connect just one of them in the pcie x16 slot afterburner wont let me overclock and in fact the hash rate during the ETH mining is very poor but if im only use the 4 pcie x1 everything i smooth and fine.

i dont know if i have setup something in the Bios for fix this issue, please help!!

Thanks!

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[droizs]

You have to flash your gpu's. There are plenty of threads here and in the ethereum forums with personalized ROMs.

[joaocha]

Hum....try conecting a hdmi cable on it (on the the gpu in 16x slot)

[Tmdz]

Its simple just change the memory clock in the rom to what you want and flash.

[Metroiid]

when the 5 GPU are connected i get this message check the SS below please.

http://prntscr.com/eq3f2g

is really necessary flash the GPU ? is no other solution?

[joaocha]

If you are on windows 7 you need to use 6x gpu mod

[Metroiid]

If you are on windows 7 you need to use 6x gpu mod

im on windows 10 x64

this issue happened when i connect the fifth GPU on the pcie x16

[otto_diesel]

bro, its about your drivers,

install 16.11.2 driver,

if it not fix; try

 first close the automatic ''driver update'' (and also windows update on windows)   (there are videos on youtube about that, its easy)

 download the ''16.11.2'' here:

 http://support.amd.com/en-us/kb-articles/Pages/Radeon-Software-Crimson-Edition-16.11.2-Release-Notes.aspx

16.11.2 is important, do not use timely new drives on rx470 and rx480,


   if it not fix; try

    restart and install DDU, (you can delete the drivers with this program). delete drivers  (close the driver update, (i m not talking about windows update, driver update is a diffrent thing. )   restart and install 16.11.2

   dont change the riser socket position everytime on mobo,

[otto_diesel]

and use gpu -z program, and take a screenshot of your card specification and install here, and we can find a custom flash for your cards,  flashing is more efficent, for energy, heat and hashrates

[Metroiid]

bro, its about your drivers,

install 16.11.2 driver,

if it not fix; try

 first close the automatic ''driver update'' (and also windows update on windows)   (there are videos on youtube about that, its easy)

 download the ''16.11.2'' here:

 http://support.amd.com/en-us/kb-articles/Pages/Radeon-Software-Crimson-Edition-16.11.2-Release-Notes.aspx

16.11.2 is important, do not use timely new drives on rx470 and rx480,


   if it not fix; try

    restart and install DDU, (you can delete the drivers with this program). delete drivers  (close the driver update, (i m not talking about windows update, driver update is a diffrent thing. )   restart and install 16.11.2

   dont change the riser socket position everytime on mobo,

    sorry about my english if you have headache again fell free to asking here or PM

Man i really appreciate your reply but i tried that and nothing :S, in fact the problem is not the 5th GPU, the issue is the pcie x16, when i use my 4 pcie x1 everything is fine.

my mobo is Asus Prime H270 PLUS

5x Asus Strix RX 480  8 GB

4GB RAM

Celeron CPU

[Metroiid]

if you only use pci e 16x or one pci 1x and pci 16x, is it make same problem ?

Yes man  unfortunately yes

[Metroiid]

i think you are in trouble bro, when you fix that can you write here about how to fix ?

sure, at the moment a friend of mine told me i need get another 4 GB RAM memory, im gonna try that and we'll see

[kernels10]

How big is your PSU?

[Metroiid]

How big is your PSU?

one Corsair HX1000i + Corsair CX550m connected