7990 and 7970 matrix

[Bazippy]

So i was going to sell my 7970 matrix,but started tinkering with the idea of keeping and crossfiring it with the 7990.
Okay i know my cpu will bottle neck but doesnt matter at the moment! Ill be using it for gaming lots and hashing when not gaming!
Here is the problem the 7970 matrix plat did not mine well infact only ever reaching 520mhash now ive seen the 280x versions hash at 720khash so id only keep if i could get this to work so id flash the bios on the 7970(never done that but im sure some reading will help)
So is this a good plan? any issues with this setup?the thing that worries me is the asus could only be controlled well with gpu tweak(which i hated) but that was the only software that could get both fans to 100%
Im hoping i can use gputweak on the asus and afterburner on the 7990?
ps yes i have enough space and yes my psu has run both these cards together at once before.

 

[apg]

yep! i do it, i mine with 7990 and game with 7970 and mine with both when away from pc. I have a 1000w superflower psu and everything is stable so no problems with it

 

[arc@css]

I think that your 7970 is already held back by your cpu a fair bit, so I wouldn't advise adding a 7990 to the mix.

 

[Avalon]

So i was going to sell my 7970 matrix,but started tinkering with the idea of keeping and crossfiring it with the 7990.
Okay i know my cpu will bottle neck but doesnt matter at the moment! Ill be using it for gaming lots and hashing when not gaming!
Here is the problem the 7970 matrix plat did not mine well infact only ever reaching 520mhash now ive seen the 280x versions hash at 720khash so id only keep if i could get this to work so id flash the bios on the 7970(never done that but im sure some reading will help)
So is this a good plan? any issues with this setup?the thing that worries me is the asus could only be controlled well with gpu tweak(which i hated) but that was the only software that could get both fans to 100%
Im hoping i can use gputweak on the asus and afterburner on the 7990?
ps yes i have enough space and yes my psu has run both these cards together at once before.

You have to be setting your 7970 up wrong in cgminer, what arguments/clicks are you using? It should easily do 700+, why not post your bat and we can help you set it up properly?

 

[Kaapstad]

You have to be setting your 7970 up wrong in cgminer, what arguments/clicks are you using? It should easily do 700+, why not post your bat and we can help you set it up properly?

I don't know much about mining but I have read that the Matrix Platinum 7970 is not good for mining compared to other HD 7970s.

 

[Deleted member 66701]

I get 740 kh/s out of my 7970 matrix plat. Clocks are set to 1070/1675 and it's flashed to the 280x mat plat.


My cgminer script:-

cgminer --scrypt -I 13 -g 2 --thread-concurrency 11200 -o pool -u user -p password -d 0

 

[Bazippy]

tried everything,lots of advice taken from elsewhere and still was getting terrible hash rate. Ive read certain matrix cards just dont mine!
So i think flashing it is the best way and to get a 280x for no extra cost just sounds cool.
I know im bottlenecked technically but 120fps in bf4 isnt exactly upsetting so adding the matrix for mining use only doesnt seem a bad idea really!

 

[Dazboots]

I get 740 kh/s out of my 7970 matrix plat. Clocks are set to 1070/1675 and it's flashed to the 280x mat plat.


My cgminer script:-

LOL thought u said matrix was bad at mining guess you took my advice on flashing the bios then. ??

 

[Bazippy]

What bios should i flash to my matrix? 280x matrix? any help pointing me towards them - Also does this mean i need to install the 280x drivers aswell as my normal 7990 drivers?
Just flashed my 7990 with the custom bios first to get things nice and sorted with that,bit daunted by flashing the matrix and trifireing it!