Best r9 280x

[G K G]

mmininginc - I have the ASUS R9 280x DC2 and 100% happy with it.
Like claygraffix I get 750kH/s with it. (undervoltaged + increased the engine clock with 80MHz)
But what I really like about this card is its superb and silent cooling system.

745khs out of the box on stock. Voltage is unlocked so you Undervolt to save power and heat which lowers fan noise as well.

My ASUS 280X-DC2T is running at 800 KH/s each while undervolted to 1100 mV (stock is 1200 mV). I paid extra for the "top edition" model. Would be interesting to see what others get with standard model.

How did you undervolt these cards? I can't get the voltage to change. Running BAMT. Tried AMDOverdriveCtrl and atitweak. Atitweak says the card is supposedly at 1.1V as does cgminer's debug_oc when starting the miner but they are always at stock when mining.

+1
I'm having the same issue....

[barabashko]

reflash their bios to undervolt, no other way

[G K G]

reflash their bios to undervolt, no other way

reflash to which version of bios? it has the 39 firmware already

[Edvin512]

sapphire trixx can do volt control for asus 280x

[crazyates]

reflash their bios to undervolt, no other way

reflash to which version of bios? it has the 39 firmware already

You use VBE7 to modify your BIOS. I used ATIFlash to copy the BIOS directly from the card, lowered the voltage, and then reflashed my custom BIOS.

[alphacenturion]

Sorry to hijack your thread but I am about to order 3 x Asus AMD Radeon R9 280X 3GB PCI-Express 3.0 HDMI  as recommended in this thread.

I am wondering which motherboard and PSU you recommend?

I am considering:

motherboards:

Gigabyte Z87X-OC S1150 Intel Z87 DDR3 ATX
or Asus M5A97 EVO R2.0 AM3+ AMD 970 + SB950 DDR3 ATX

PSU:

Corsair AX1200i 1200W Digital ATX Power Supply 80 PLUS® Platinum

Is the 1200w too excessive? It's a pricey unit but I've heard good things.

Any opinions would be greatly appreciated.

[Wipeout2097]

See if the EVGA Supernova 1300W or Seasonic X 1250W is more affordable. Either way, check for 1 point reviews on Newegg and Amazon

[alphacenturion]

See if the EVGA Supernova 1300W or Seasonic X 1250W is more affordable. Either way, check for 1 point reviews on Newegg and Amazon

1 point reviews for the corsair? I can't find them?

Thanks for the tips on the others I'll see what prices I can find.

[Wipeout2097]

See if the EVGA Supernova 1300W or Seasonic X 1250W is more affordable. Either way, check for 1 point reviews on Newegg and Amazon

1 point reviews for the corsair? I can't find them?

Thanks for the tips on the others I'll see what prices I can find.

The Corsair seems even worse. Lots of defective units

[crive]

I have a mixture of Sapphire Dual X, Gigabyte and MSI gaming 280x's. 
Overall in terms of performance, power usage and price the Dual X comes out on top, especially power usage

[Gazza1]

How are the MSI and Gigabyte warranty departments?  Good, bad?

[atp1916]

My MSI 280xs are all ~820-830khs.

[Quelle]

Got one 280x Sapphire vapor-x and Asus 280x DCII TOP. I would say the hashrates are pretty much the same (no custom bios just 1050/1080 and 1500)

But when it comes to heat and noise... the difference is day and night  Asus blows sapphire out of the water so bad it aint funny. ++85c core and +110c VRM's on the vapor-x! Fan noise is also terrible. Mind you i kept them on my normal Fractal R3 case with 5 fans but still. I can run the Asus at 50% fan while staying at 75c full load (VRM max 75). I would get the Asus for rigs without cases and pretty much anywhere if it were in stock. Sapphire Vapor-X if its the only thing you can get your hands on with mandatory undervolting and good overall cooling.

[G K G]

Got one 280x Sapphire vapor-x and Asus 280x DCII TOP. I would say the hashrates are pretty much the same (no custom bios just 1050/1080 and 1500)

But when it comes to heat and noise... the difference is day and night  Asus blows sapphire out of the water so bad it aint funny. ++85c core and +110c VRM's on the vapor-x! Fan noise is also terrible. Mind you i kept them on my normal Fractal R3 case with 5 fans but still. I can run the Asus at 50% fan while staying at 75c full load (VRM max 75). I would get the Asus for rigs without cases and pretty much anywhere if it were in stock. Sapphire Vapor-X if its the only thing you can get your hands on with mandatory undervolting and good overall cooling.

I've two vapor-x and 1 Asus and had been working inside the same room with these.

Finally i placed these rigs inside garage yesterday. the noise was making me crazy. asus was silent as a cat. but the vapor-x screamed the hell outta me

[humorme201]

i have 4 r9 280x Sapphire Dual-X OC version and my hashrates are appauling...what should be the proper cgminer settings...I can't get them above 580 or so...using risers and temperatures on all cards are well below 70.  Using latest Catalyst drivers and SDK from ATI all under Windows 8.1.  Really struggling here...any all help would be greatly appreciated.  Using a Corsair 1200ai PSU and Asrock H81 Pro BTC mobo.

Thank you 

[Billyboy402]

i have  the Asus R9280X-DC2-3GD5 but say , i quite like them  cheap but powerful quite and cool

24/7 mine is only running at 62c on stock setting

for for some reason i can get it to get off 700 hash some time 707 to 699 but avg 700

how are you manage to push it pass 700 ,.  when i change any stock setting it get worst ,

[alphacenturion]

the best 280x is the one you can find for retail price.

good luck. 

This. I've got the MSI - wanted the ASUS but its still decent.

[tyfeonas]

i have  the Asus R9280X-DC2-3GD5 but say , i quite like them  cheap but powerful quite and cool

24/7 mine is only running at 62c on stock setting

for for some reason i can get it to get off 700 hash some time 707 to 699 but avg 700

how are you manage to push it pass 700 ,.  when i change any stock setting it get worst ,

try this settings.

mine makes 765khs

setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
.\cgminer-3.7.2-windows\cgminer.exe --scrypt -o stratum+tcp://*******com:3333 -u user**** -p pass* --intensity 13 -w 256 -g 2 --shaders 2048 --thread-concurrency 8191 --gpu-engine 1100 --gpu-memclock 1500 --gpu-powertune 20 --gpu-fan 68

[paul09]

My favorite is Asus TOP edition

Get 800-810kh/s on all of them at 1150/1800.

Cost ~$410AUD(~$365USD) each to buy at local computer shops in Melbourne

[infojunkiePHD]

I have two HIS 280x, they're solid cards. They've got huge coolers on them, and both average 745-750 clocked to  1080/1500.  I did have one that was bad out of the box - ran hot and flaked out, but tbh that's common enough - just RMA it.