I am interested in mining with dashminer, but it seems much slower and cards much hotter. My average x11 hashrate on any other pool using sgminer and wolf0's bin is 3.7 per r9 270 and temps never hit 70. With dashminer it shows 45% for speed, my math might be off but it seems I should be up around 78% if 4.84 is 100%. Am I missing something or am I really giving up that much speed using dashminer?
Sorry, yes. Your math is completely wrong.
Don't count megahashes at all.
Only count payout per day. 45% is 0.45 * 0.00394BTC == 0.001773 BTC per day per R9 270.
(0.00394BTC per 100% is today's rate)
And now compare this 0.001773 BTC per day with whatever you were paid before per day for each card.
Also dashminer software shows you income per day in DASH coins. DASH to BTC exchange is around 0.0013 now. Also there is a daily bonus, which is around 10% - 20%.
Thanks!