Actually, WU usually levels out to ~0.9 what your KH/s is. If you're running 800KH/s, you should be getting a WU:~720. Of course, this is all random, and sounds like you've had a stretch of good luck!

When we reboot our rigs, we notice massive swings in the WU until they eventually level out. We've seen as low as 500, and as high as 1200 per GPU. They eventually even out, tho.

Come back in 48 hours, and see what it says.

Don't buy XFX, get a Gigabyte R9-270 OC or some Sapphire which gives even higher hashrate. Search around for best brands, memory types, temperatures, noise, etc...

To the poster above, did you have to plug them and install by a particular order, or you plugged both, installed drivers and they did "just work"?

Speaking of which, has anybody ever seen an idiots guide to all the commands available to CGMiner?  I'm plunking in all these tags and numbers based on the recommendations of other users, but I'm not quite sure what most of them actually mean, or if they can be further optimized for my particular card.

I'm about to run out to the store to buy myself an XFX R9 270 to either add to or replace my EVGA GTX 660ti.  I'm curious if anybody has a success story of combining GPU's in one machine without the nightmare of driver conflicts?  The 270 would end up being strictly for mining with the 660ti taking care of the rest of the system.  I'm using Windows 8.1.

Over time electricity is the main expense, that is just a fact.

I am all but done with purchasing mining equipment that is not being designed to mine, also I don't spend fiat on mining equipment anymore. These were essentially free minus my initial hardware expenses 10 months ago and electricity. And an HD 6850 is still horribly inneficient as far as khs/kwh

Everything is more expensive in Cali near the beach. Also have mouths to feed.

I bought a mining item that costs less to operate and is at least 300x more efficient than my first rig. Denial is a tough pill to swallow, the btc guys had to do it when ASIC was developed and so will the alt guys. ASIC is not a bandwagon, it is the future.

That about covers it.

You should read about Moore's law the next time you are thinking about buying your next $800 gpu.

got mine at BTC.107 per and they run at 70khs. Also they hash out in BTC only mode as fast as an antminer U1. For four of these it is cheaper than building a whole rig. And it is portable and way cheaper on power. When the price comes down, and it will, those who went all in on GPU for scrypt will be wondering what happened. These will eventually cause difficulty to skyrocket and a new algorithm will need to be developed, sound familiar?

You're referring to these, right?   www.dualminer.com
They're interesting, I'll give them that.  They're available but still seem way to pricey for the output.  ROI is too far out.  The only appealing aspect is the power consumption.  Then again, we've seen how the Bitcoin block erupter USB's became obsolete so you know it's going to happen to these as well and they won't have a resell value like a gaming GPU.  There will need to be a price drop/output increase for these to catch on at this point in the game.

Nope they are real. People in the forum have them and are running test right now. Lets face it.... it will be the same cycle as Bitcoin... first CPU, then GPU then FPGA then ASIC's. SCRYPT will follow the same exact pattern.

I would say its almost to late to invest a large amount of capitol in GPU as everyone now will switch over to ASIC's.

I've seen a couple of sites claiming to have pre-order Scrypt ASICs but is there any concrete evidence that they exist?

Will do and update.

UPDATE : GPU load remains stable at 99%. What else could be causing the fluctuation in current ? 

As Im in europe and I got 230v outlets, is anything different?

Hi,
One of my cards sometimes fluctuates the current level shown in GPU-z

The normal current lievel VDDC Current is 93-94 A (Amps).

However the card sometimes falls to 76-77 A for a few seconds and comes back to the level earlier.

Is this normal ? Or it something wrong perhaps with my PSU ?

PS: I recently had one of my burnt cards replaced so don't want the same situation again.

I have a rig with 5 r9-270s in it and only 4 are being detected by the motherboard.  I know that only 4 are being detected by the motherboard because it is a MSI A88x-G43 which has a hardware display built into the uefi.  Has anyone had any experience with this problem?

I'm new to mining and the reading I had done had me under the impression that the graphics card was the dominant factor in determining what you could get out of your rig.  However, I started with getting about 400 kH/s with the XFX R9 270 on my work/gaming machine, and then decided to try to stick some XFX 7950s into a crappy rig with a Celeron, cheap Gigabyte mobo and cheap memory, and it is giving me almost nothing.  If I take the 7950 and put it in my "good" machine, I can get about 530 kH/s stably without touching other options; in my cheap rig, I get about 150 from the exact same card before it explodes with HW errors.  With overclocking, I can get my good machine to do about 630 kH/s with that card before I start getting occasional (~2%) rejections (still no hardware errors).

Am I doing something wrong, or did I just pick some bad components for the rest of the rig?

My new Watt-o meter shows approx 1400W

From the information I've come across, litecoin source contains SHA256 algorithms, only the memory requirement is more.

Why not add massive 500GB of non ECC memory to a server board and some bitcoin mining chips?

Am I missing something or is 3TH of scrypt hashing power on ltc just not worth the effort to any dev out there?