I'm just looking for people's opinions on what the best card is and why.  I have some rigs right now, 3 are running 5 x R9 270 and one is a mix of a 270x/270/7950.  I'm looking to do two more and was considering going with R9 290's as they've come back down in price a little and are readily available.  That, and they are one of the higher-end cards, so hopefully they'll retain most of their value.

I know Gridseed has far less wattage / kw, but I'm concerned with resale value; GPU's are GPU's and have another main use besides mining while Gridseed's are used only for mining.
 I can resell GPU's later for close to what I paid, Gridseed becomes worthless when new hardware comes out.  That and I only pay like 0.06 / KW.

[Fixed!]  I switched to SGMiner and pretty sure I had them labeled incorrectly 


I have 2 cards up and hashing away, but I cannot get my 7950 above 420 kh/s.  The 270x is at 550 solid which is what I anticipated, I found these settings on reddit.  Any higher would be better though~!

I've messed with the clocks a little, it is set to 1000/1500mhz right now.  Won't go any higher though (saw some push it to 1100/1700; mine locks the system up and crashes)

Using latest AMD drivers + sdk also.

Here's my settings, Sapphire DualX R9 270x is GPU 0, AMD 7950 is GPU 1.

"intensity" : "19,20",
"vectors" : "1,1",
"worksize" : "256,256",
"kernel" : "scrypt,scrypt",
"lookup-gap" : "0",
"thread-concurrency" : "20400,21712",
"shaders" : "0",
"gpu-engine" : "0-0,1000",
"gpu-fan" : "0-85,auto",
"gpu-memclock" : "0,1500",
"gpu-memdiff" : "0",
"gpu-powertune" : "0,20",
"gpu-vddc" : "0.000,d",
"temp-cutoff" : "90,90",
"temp-overheat" : "80,80",
"temp-target" : "70,70",
"api-mcast-port" : "4028",
"api-port" : "4028",
"expiry" : "120",
"gpu-dyninterval" : "7",
"gpu-platform" : "0",
"gpu-threads" : "1",
"hotplug" : "5",
"log" : "1",
"no-pool-disable" : true,
"no-submit-stale" : true,
"queue" : "1",
"scan-time" : "30",
"scrypt" : true,
"temp-hysteresis" : "3",
"shares" : "0",
"kernel-path" : "/usr/local/bin",
"device" : "0,1"

I'm looking into building a GPU rig, already have a spare tower sitting in my other room that had a burnt out CPU.  It has an ASUS M4A79XTD EVO, with 2x PCIe 2.0 x16 and 2x PCIe x1.  Does that mean I can run 4 cards, right?  And I need to get risers (do they have to be powered?) for the 2 x1 slots also, correct?

I was just looking at upgrading the board also, since he put this together a few years ago, but if it can handle 4 I should be OK for right now.  I got a good deal on a 7970 so I'm going to make this an all-in-one mining hub to control several cubes, some GPU's, and some worthless USB sticks

Also, if I have multiple cards can I run guiminer/cgminer multiple times with parameters for litecoin and one for another scryptcoin at the same time?  Or is it all the cards at once per program?