Quote from: feeleep on March 13, 2014, 05:38:29 AM

Quote from: phm on March 12, 2014, 05:54:12 PM

Quote from: feeleep on March 12, 2014, 12:02:02 PM

Quote from: phm on March 12, 2014, 11:55:17 AM

There is target adjustment in sph-sgminer depending on the coin, this is what DM_SELECT(1, 256, 65536) does. Currently for darkcoin and myriadcoin-groestl truediffone is multiplied by 1, for quarkcoin and qubitcoin it's multiplied by 256 and for scrypt it's multiplied by 65536.

so here may be the problem - quarks should have diff1 similar as sha256 coins (so multiplier = 1)

Are you sure about this? Because for example hash of BTC block 10 (difficulty = 1) is:

000000002c05cc2e78923c34df87fd108b22221ac6076c18f3ade378a4d915e9

and hash of QRK block 600 (difficulty = 1.01576304) is:

00000096b99f154706b957c0e36cc4bf3789849e8a0684278dffac607b404641

so QRK definitely has higher target than BTC for this difficulty, otherwise this block would not be accepted. I'm not an expert in this, though.

Also take a look at:

https://github.com/bitcoin/bitcoin/blob/master/src/rpcblockchain.cpp#L36

and

https://github.com/MaxGuevara/quark/blob/master/src/rpcblockchain.cpp#L31

In BTC dDiff is multiplied/divided by 256 until nShift is 29 while in QRK it's multiplied/divided by 256 until nShift is 30 - so IMHO for two difficulties with the same value target value will be shifted by 8 bits.

Note that sph-sgminer displays network difficulty correctly for Quark and QubitCoin. It wouldn't be correct with wrong multiplier.

I understand this but there is one problem - in original CPU miner from Neisklar (https://github.com/Neisklar/quarkcoin-cpuminer) I am pretty sure diff1 is set the same as sha256 and it is used by thousands of users...

However I set up a separate stratum port (once again) for GPU users on Securecoin pool. As I dont have any GPU rig now could anyone test it for a while and post results?

mine1.coinmine.pl:6021

feeleep

I can do this for you, is securecoin a Quark fork, I've barely even heard of it?

where is the miner ? or do you want me to compile a source, i have access to a windows option and Linux.

i.e where is the GPU miner i should use to test GPU for securcoin ?