What GPU to add?

[jdebunt]

Hello people,

currently i'm running with the following setup :

Mobo : MSI 970A-G46 SockelAM3 +
Memory : 2x Kingston HyperX Blu 4 GB DIMM DDR3-1600
CPU : AMD Phenom II X4 965 Black Edition processor - Socket AM3/AM2 + (3400MHz)
HDD : old sata HDD with Windows 7 home edition (x64)
Video card : Sapphire ATI HD 7970 grafische kaart (PCI-e, 3 GB GDDR5
PSU : Be quiet! Pure Power CM BQT L8-CM-630W PC voeding (630 watt)

Extra fan : TRICOOL Antec 120mm Blue LED Case Fan (connected to the mobo so i assume this is also drawing some power )

What video card would you recommend i add to this system?

My 7970 is overclocked (1085 engine clock, 1500 memory, 10% powertune)

I am willing to downclock it again to normal speeds if that means it's slightly safer to add another card . Perhaps even ake out 4 GB of ram if that would make a difference

Any tips are welcome

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[zackclark70]

I have 3 7950s on a hx750 psu  I would go for a 7950 and underclock / undervolt the cpu  and run the new 7950 at 1050 core 1250 ram 0.150v core you will get 630+kh on a 7950 with those setings ( I have found the 7950 vapour x to be the best  

[FiatKiller]

None. GPUs are nearly worthless. But another 7970 if you insist. Removing RAM never helps.

[zackclark70]

gpus are still good for alt coins !

[jdebunt]

I have 3 7950s on a hx750 psu  I would go for a 7950 and underclock / undervolt the cpu  and run the new 7950 at 1050 core 1250 ram 0.150v core you will get 630+kh on a 7950 with those setings ( I have found the 7950 vapour x to be the best  

that was my initial thought aswell, but would you combine it with also downclocking the 7970 a bit or just put it in & see what happens?

None. GPUs are nearly worthless. But another 7970 if you insist. Removing RAM never helps.

I'm not mining BTC directly, i use it for altcoins and it's still worth the money for now, so i guess now is the time to act

2 7970's on a 630W PSU? Not sure that'ld work?

[zackclark70]

buy your self a watt meter and make sure you don't pull to much wattage from your psu and you will be fine a 7950 vapour x with the setings I posted uses less than 220w mining script getting you 630+kh

[FiatKiller]

With two 7970s, I would go with an 800 at least. You have to leave 10-20% margin because they rarely do what the rating is. And Silver or Gold rating is worth it.