How to get +1300Kh/s with 2 280x ?

[luckyguy2807]

I have 2 r9 280x connected, without crossfire on the same motherboard
I use -I 13 -g 2 -w 256 --shaders 2048 and I get a maximum speed of 1100 kh/s.

Do you know what line or what should I do to get around 1400 kh/s?

My fan is at 100 power, tem is steady around 60-65 degrees and i''m using cgminer 3.5.0

[the[K]id]

I would  use -I 13 -g 2 -w 256 --gpu-engine 1050 --gpu-memclock 1500 --thread-concurrency 8192

With 3.7.2 and 13.12 drivers I see ~700 per card with this.

[WickedCruelty]

Hey there, so let me first say i got a Sapphire Vapor-X 280x.

With that being said let me tell you i'm getting aroun 700-730kh/s.

My temp is around 69C and my fan is running at around 43-45% only.

If you want to try and duplicate my results here is how i run my cgminer 3.7.2:

Code:

setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer.exe --scrypt -o < MY POOL URL HERE > -u <WORKERNAME HERE> -p <PASS HERE> -I 13 -g 2 -w 256 --thread-concurrency 8193 --shaders 2048 --gpu-powertune 20 --temp-cutoff 90 --temp-overheat 85 --temp-target 71 --gpu-fan 43-100 --auto-fan --gpu-engine 1052 --gpu-memclock 1498

If you don't have the same card i suggest you play with the thread concurrency, gpu engine and gpu memclock to get the best results.
Hope this helps

[ExPMCom]

My card 7970 - ASUS x 2 (1420 Kh/s):

cgminer.conf

Code:

{
"pools" : [
        {
                "url" : "POOL",
                "user" : "USER",
                "pass" : "PASSWORD"
        },
        {
                "url" : "POOL",
                "user" : "USER",
                "pass" : "PASSWORD"
        }
],
"api-listen" : true,
"intensity" : "19",
"vectors" : "1",
"worksize" : "256",
"kernel" : "scrypt",
"auto-fan" : true,
"temp-cutoff" : "85",
"temp-overheat" : "75",
"temp-target" : "70",
"expiry" : "30",
"gpu-dyninterval" : "7",
"log" : "5",
"queue" : "1",
"retry-pause" : "5",
"scan-time" : "30",
"scrypt" : true,
"temp-hysteresis" : "3",
"shares" : "0",
"shaders" : "2048",
"thread-concurrency" : "24768",
"failover-only" : true,
"gpu-thread" : "1",
"gpu-engine" : "1100",
"sharethreads" : "32",
"lookup-gap" : "2",
"gpu-powertune" : "20",
"gpu-memclock" : "1500"
}

[irlandescoin]

I have 2 r9 280x connected, without crossfire on the same motherboard
I use -I 13 -g 2 -w 256 --shaders 2048 and I get a maximum speed of 1100 kh/s.

Do you know what line or what should I do to get around 1400 kh/s?

My fan is at 100 power, tem is steady around 60-65 degrees and i''m using cgminer 3.5.0

my advice is: don't use crossfire , with 2 graphic cards u can get 1400 or 1480kh/s

that script it what i use

cgminer.exe --scrypt -o http://stratum4 -u user -p 123456 -I 13 -g 2 -w 256 --thread-concurrency 8193 --shaders 2048 --gpu-powertune 20 --temp-cutoff 90 --temp-overheat 85 --temp-target 71 --gpu-fan 43-100 --auto-fan --gpu-engine 1052 --gpu-memclock 1498

my another advice is: if your card is new not burn it now just use 530 kh/s  after u can burn ,i know saphire is overclocked  but is like a new car u need go easy

thats script run 530 kh/s

cgminer.exe --scrypt -o http://stratum -u user -p 123456 -I 14 -g 1 -w 256 --thread-concurrency 15232 --auto-fan --temp-target 65

[techcoin12]

i agree .. cross fire is a waste for mining ...

it is also better for trouble shooting with out it plugged in

1040 core and 1500 mem is a nice lower electric cost solution and much more stable for most cards

good luck