question about dual psu and gpu?

[rickyman123]

I have evga 1000 gold and rosewill 750w gold.

I am wondering where shall I put 2 x 290, 1 x 270x, mb, riser and etc.

1. 2 x 290 non x and riser sata on 1000 and rest on 750w

2. 2 x 290 non x on 1000 and riser, 270x rest on 750w

which one is better?

this is my config:

{
"pools" : [
{
"url" : "stratum+tcp://us.clevermining.com:3333",
"user" : "unknown",
"pass" : "workerpassword"
},
{
"url" : "stratum+tcp://useast.wafflepool.com:3333",
"user" : "unknown",
"pass" : "backupworkerpass"
}
]
,
"intensity" : "20,20,19",
"worksize" : "512,512,256",
"lookup-gap" : "2,2,2",
"thread-concurrency" : "32768,32768,16000",
"gpu-engine" : "1000,1000,1100",
"gpu-memclock" : "1250,1250,1465",
"expiry" : "5",
"failover-only" : true,
"log" : "5",
"queue" : "0",
"scan-time" : "1",
"device" : "0-2",
"gpu-powertune": "0,0,2",
"no-submit-stale" : true,
"gpu-threads" : "1"

it seems that both of my 290 ( both xfx)

xfx 290 ref - 860 kh/s and around 700-800 WU/s ( around 750 marks) and no higher
xfx 290 non ref- 750 and around 600-700 WU/s

why is that low? please help me.

ty

 

[Mega666]

Either way has plenty of power but leaning option (2),

 

[rickyman123]

if I add another 270x and riser, which psu will I put it?

 

[Digital Viper-X-]

You could probably run them all on the 1000w unit. You'd be pulling roughly 850w from what you listed.