LTC/BTC Mining Config

[santzmamuerte]

I've recently bought 2 XFX 7970 Black Edition GPUS and been tweaking with my settings.

I can't seem to break the 350 range per GPU.


Ran into a forum that gave me a formula to use,but when I hit the sweet spot(Highest amount of hashrate before crash)my GPU Engine is pretty low,while my Memory clock is high.

GPU Clock:731
Memory Clock:1550

How far off should the GPU Clock be from the Mem clock?

Is that config safe?(731/1550)?

 

[Novuake]

You need a high GPU clock. You are doing it the wrong way around.

You can leave your memory clock at stock, the only reason people drop it is to conserve as much power as possible.
BTC mining does not use near the available memory speed that these cards have but can utilize all the available GPU power.

 

[santzmamuerte]

You need a high GPU clock. You are doing it the wrong way around.

You can leave your memory clock at stock, the only reason people drop it is to conserve as much power as possible.
BTC mining does not use near the available memory speed that these cards have but can utilize all the available GPU power.

Repeat this until after adding a 5mhz step the hashrate goes down a LOT (like 50-100 kh/s drop). You should be able to get to 600+ kh/s this way. Once you get to your "peak" engine speed - where going past it in engine clock actually noticably slows down your hashrate - take note of the RATIO of core clock vs your memory clock (1500) - it'll usually be around 0.61. (ie: memory is 1500 mhz, gpu is 915mhz: 915/1600 = .61).
Armed with your "magic ratio" (this is different for every card)... start clocking up the memory in 10mhz steps until your system hangs (leave the engine core at whatever speed it was at before, don't touch it just yet even if your hashrate goes down).
After it crashes, take 20 off of the memory speed you achieved before crashing.
Now, take that final memory speed, and multiply it by your magic number (.61 for example) and that will be around the engine speed you want to ideally be at for best hashing, check +/- 20 mhz from this number in increments and see which yields your best speed.
For example, if you got to 1650mhz before it crashed, back down to 1630, and put your engine/core up to 994mhz (1630 * .61). This should give you a good hashrate ~> 700kh/s. If it's LOWER, then lower your gpu speed by a few mhz until it springs up to a nice hashrate. This is your sweet spot. Put this memclock + gpuengine in your cgminer startup script."

Is what I went off of.

I'll try your method and see if that works!

 

[santzmamuerte]

You need a high GPU clock. You are doing it the wrong way around.

You can leave your memory clock at stock, the only reason people drop it is to conserve as much power as possible.
BTC mining does not use near the available memory speed that these cards have but can utilize all the available GPU power.

Just tried your method and I lost more than half my hashrate.

Side note,what is power tune,and how/what does it effect?

 

[Novuake]

PowerTune is an algorithm that adjust clock rate to stay within a certain fan speed and temperature bracket.

How are you testing your hashrate so fast? 15 mins?

 

[santzmamuerte]

PowerTune is an algorithm that adjust clock rate to stay within a certain fan speed and temperature bracket.

How are you testing your hashrate so fast? 15 mins?
10 to 30 minutes depending on the temp of each GPU.

On a side note,my GPU in slot 0,seems to overheating regardless of configs.

What could cause this problem?

 

[Novuake]

XFX cards are known for overheating issues.
WHat is your full system specs? Exact models.

Is the airflow sufficient?

 

[santzmamuerte]

XFX cards are known for overheating issues.
WHat is your full system specs? Exact models.

Is the airflow sufficient?

Model No: FX-797A-TD
Both are have the same model number.

Airflow is great. Running NHD14,corsair 500r,and an outside fan on it.

 

[Novuake]

Just one chassis fan?
What PSU?

 

[santzmamuerte]

Just one chassis fan?
What PSU?

There's a 240 on the side panel,two in the front(Removed both bays),2 Noctuas(NHD14).

PSU: Seasonic 850W Gold.

 

[Novuake]

Ah well must be the typical XFX card then.

 

[santzmamuerte]

Ah well must be the typical XFX card then.

I've been watching my the temp of GPU and the heat ranges radically.

Stays at 77,jumps to 85,then drops to 68 in about a 30-55 second span.

Should I be worried?

 

[Novuake]

Nope, those temps are actually very good for a dual GPU setup.

 

[troublegum]

Guides for fast CPU coin mining and windows cryptocurrency apps at
http://cryptocurrency-mining.blogspot.com