A user called ghostlander on Bitcointalk has released a new optimized OpenCL kernel for the Myriad-Groestl algorithm that is supposed to give you at least 10% increase in performance compared to the public kernel available, but in reality the hashrate increase is much more significant. We have tested the new kernel with a Radeon R9 280X GPU and got over 31 MHS while with the latest sgminer kernel we have managed to get only about 10 MHs or with other words about 200% increase using intensity of 19. You can try to increase the intensity a bit more if your GPU manages to handle it ot squeeze a bit more extra performance as well over 19. So if you are mining a coin using the Myriad-Groestl such as DigiByte or Myriad on AMD hardware you should definitely consider upgrading the kernel (just replace the old .cl file with the new one) to get a lot of extra performance and increase your hashrate.

– Download sgminer 5.1.1 for Windows with the new myraid-groestl optimized kernel…

• New GMiner 2.04 With Support for the New KAWPOW Algorithm
• New ccminer 2.2.6 Tpruvot Fork with PHI2 and Allium Support
• Alternative cgminer 3.7.2 for Scrypt Mining on Gridseed 5-chip GC3355 ASICs
• New sgminer 5 Dev with Neoscrypt Workaround Fix for AMD Users
• CryptoDredge 0.16.0 Nvidia Miner With Added X16RT and Lyra2zz Algorithm Support
• Mining Feathercoin After the NeoScrypt Fork with AMD and Nvidia GPUs
• Optimizing Nvidia GPUs for Performance with Lower Power Usage for Kaspa (KAS) Mining
• The Latest SRBMiner 1.7.9 Cryptonight AMD GPU Miner is Ready for the March 9th Monero Hard Fork
• Updated cgminer 3.7.2 and cpuminer for Overclocking Gridseed 5-chip GC3355 ASICs
• WildRig Multi 0.12.5.1 Beta With More Algorithms and Performance
• Updated Windows Binary of the ccMiner 1.5.63-git Fork by SP for Maxwell
• Updated z-enemy 1.20 Miner With Better Performance and BCD Support
• NiceHash EQM Zcash Nvidia Optimized Miner for Windows Now Available
• New T-Rex 0.8.3 Nvidia Miner With Support For the New X21S Algorithm
• New ccMiner Fork with Optimized Kernels for Maxwell by SP
• SUQA’s hardfork is Right Around the Corner, Get Ready for SINOVATE (SIN)
• New Faster z-enemy 1.16 Nvidia GPU Miner With Extra Performance
• Updated cpuminer-multi 1.2-dev Windows Binary
• New Merit (MRT) Nvidia GPU Miner – zjazz CUDA Miner
• Updated Windows Binary of the ccMiner 1.5.29-git Fork by SP for Maxwell
• Download sgminer 4.1.0 for Talkcoin GPU Mining for Windows
• Updated Miner Control 1.6.4 Pack for Nvidia GeForce GTX 750 Ti
• New Official Merit Miner 0.5 for Windows With Some Improvements
• Bitcoin Interest (BCI) and the New ProgPoW Mining Algorithm
• vCrypt-capable Nvidia ccMiner fork for Mining vDinar (VDN)