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R9 270, underrated? "the holy grail of mining rigs 2 important metrics" - Page 3

post #21 of 120
270x is definitely undervalued ATM. They perform almost as well as the 2GB PowerColor 7850's that get up to 425 KHs.
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post #22 of 120
So basically, if I'm building some rigs, I might as well get the 270 over the 270x for the same performance for less money?
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post #23 of 120
I'd like to share my experience thus far. I'll start with my specs
  • Gigabyte socket FM2/FM2+ G1 Killer A88X (drivers for a sniper)
  • AMD Athlon X4 750 @ 3.8 GHz (1.000V)
  • 2x4Gb G Skill Ripjaws Ddr3-2133
  • Western Digital Caviar Blue 250gb
  • XFX Radeon R9 290
  • Seasonic Platinum 660W PSU

I'm adding an Asus R9 270x DC II to the system. Removed drivers, PC off, install card, boot, install drivers.

Plug HDMI into 290 and start a test mining with 270X.Results are bad. 300 - 320 kh/s
Overclock!

350.

Cool. Let's start mining both cards.

290 hashrate drops from 850 kh/s to 650. 270x sucking. 275-300.

Let run for 5-10 mins and shuts down. I'm not genius, but im well aware that its very close to the upper limits of the PSU. I do have an ax850 laying in wait. My biggest question is what is making the hashrate so low when the cards run by themselves? Even the 290 dropped hashrate with the 270 installed. As soon as I removed the 270, hashrate is right back up at 850+.

Anyone seen this? Is there a fix for it? I don't see this 270 pulling 400+ as others have reported. Very disappointed so far.

Sent from my Nexus 7 using Tapatalk
post #24 of 120
Quote:
Originally Posted by HardwareDecoder View Post

the 290 does about 830-850 hash with some saying as high as 880... My 290x and most others do 880 hash.

So it isnt worth the price increase at all for a 290x over a 290. Same as gaming.

All 3 of my 290 do 830 khs on STOCK settings, I can easily get 870 with a overclock of 990/1500
post #25 of 120
Quote:
Originally Posted by CravinR1 View Post

All 3 of my 290 do 830 khs on STOCK settings, I can easily get 870 with a overclock of 990/1500

we will see how it works out but my 290x had to be underclocked on the core all the way to 920 to get the best hash rate.
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post #26 of 120
One of my 7950 gets 626 khs 1105/1500 the top one gets 470 khs and I have to underclock 860/1250 due to heat frown.gif

The 290 in a case doesn't have that problem and the top one doesn't get much hotter, I think the 2 fans of the Dual-X is sucking in heat off the bottom card pcb
post #27 of 120
Quote:
Originally Posted by CravinR1 View Post

One of my 7950 gets 626 khs 1105/1500 the top one gets 470 khs and I have to underclock 860/1250 due to heat frown.gif

The 290 in a case doesn't have that problem and the top one doesn't get much hotter, I think the 2 fans of the Dual-X is sucking in heat off the bottom card pcb

I'm worried i'm gonna have problems keeping the new 290 cool.... It is a reference model and my case doesn't have good air flow since all my fan spots are connected to radiators pushing air out of the case...

It's fine though I'll just put this rig in the basement where it is super cold and put a box fan up to the side of it. I'm gonna be mining solid for atleast 3 months until I get some ROI on both of these cards. I will also just run the 290 fan @ 90+ I give 0 clucks if the fan burns out I have a second reference cooler from my 290x


I should mention I just switched to linux for mining since windows would get some vague blue screen error every 5-8 hours. Not having that problem so far on linux and my card is running 5c cooler underwater while mining from a max of 54c to 49. I'm getting the same avg hash rate too.

idk how to check vrm temps on linux though
Edited by HardwareDecoder - 1/6/14 at 1:11pm
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post #28 of 120
Interesting thread....

I have been working this same theroy for a couple months now, and it does seem like the 270/270x cards are the way to go.

I have two gigabyte 270x's in my rig, and cgminer reports a hash rate of ~470kh/s+ on each card.

Also, when I view my has rate graph in my pool account, my has rate does spike to close to 1500 kh/s several times a day.

I have been trying to put my finger on what my hash rate really is, yet my evidence gathering is still inconclusive.
post #29 of 120
Anyone with Asus 270X like mine, I stumbled across a post on reddit. Seems a BIOS update is all that's needed. Testing now.

http://redd.it/1t0nv7
post #30 of 120
you guys getting 450+ hash rates... what are your settings? i can only get like 415 out of mine.
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