I'm also missing out on the 50% bonus for most of my runs on the 750Ti but only because I don't crunch during peak power times as the electric costs are hiked up too much. That's 3h/day M-F. Most long WU's still take around 78,000sec (21.5 to 22h) so I'm only missing out by 0.5h to 1h, but I'm stable :)
My 750Ti sits along side a 970, so if I babysat the rig I could suspend and restart tasks once a day in order to get them to run on the different card and thus finish in time for the bonus. Could probably script it, but it's not a biggie for me.

See there's a GTX950 out. With 1572GFlops (compared to the 750Ti's 1306) it should allow tasks to finish in time (even with the WDDM overhead). On paper it's 20% faster, but uses 90W compared to the 750Ti's 60W. That's a 20% performance gain for 50% more power, which isn't great, but I suspect it might not be quite as bad as that. It may be the case that performance is a bit higher than +20%; it officially boosts from 1024 to 1188MHz (up 164MHz) while the 750Ti on paper only boosts from 1020 to 1085MHz (a 65MHz boost). In reality the 750Ti boosts to 1300MHz, if not more, so I would expect the 950 to boost well beyond 1188MHz - probably 1350MHz or more. Assuming 1350MHz for 90W would equate to a 25% performance increase over a 750Ti for 50% power increase, however it's likely that the card could be tuned for performance; the power throttled down, and it would still boost to around 1250 if not 1350MHz.

There may be a power overhead to having Sli capability, which the 950 does (the 750Ti and 750 are not Sli capable).
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