Re: SRBMiner Cryptonight AMD GPU Miner V1.5.1

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also, anyone able to get 750h/s+ on RX 580 4GB models?
my 8GB models do 1000h/s+ SOMETIMES but cant get 4GB any higher.

I get 1040 h/s on my armor rx 580 hynix 8 gb I=55 and 720 h/s only on my nitro+ rx 480 elpida 4 gb I=29.5, I tried different timing straps on the 480, but it didn't change much

One strange thing is that the reported hashrate change each time I restart the miner
(most of the time, it's one time good, with 1040 h/s on the rx-580 and one time "bad" with 930 h/s on the same rx-580... and it makes comparison difficult)

I got that exact problem, my rx 480 4gb is always stuck at 730h/s but my 2 rx 580 8gb are crazy, miner starts with both doing 950h/s or first 850h/s and second 1050h/s. I am always restarting im till second gives 1050h/S and then the first one seing tv shows or sometimes from nowere will go to 950-990h/S. The values are very unstable.

rednoW already explain in cast xmr thread and that explanation more make sense for me.
below are explanation from rednoW:

Quote

In case of normal v7 vega with 16gb becomes compute bounded. Vega 8gb is memory size bounded with heavy.
It is just like with polaris 8gb and v7. You can set intensity to use all 8gb ram but due to lack of compute units it cannot handle it. But with heavy Polaris 8gb uses all its memory and has the same hashrate as with v7

so basically my understanding for CN-V7 is compute bounded in RX 580 8 GB because even if you set higher intensity it will not increase hash rate. while for CN-Heavy is memory bounded in RX 580 4 GB because CN-Heavy used more memory than CN-V7.