It's not just something to do with AMD chips. My i7 normally gets around 17k PPD but only does around 9k on the 7611's. I'm pretty sure 7611 was re-benchmarked and the results on the benchmark machine (an i5-750) turned up the same. That's not to say that architectural differences between the benchmark machine and other machines won't produce dramatically different PPD figures, but the Pande Group is limited in how much hardware they can test new projects on, and trying to benchmark across multiple machines would probably be too big of a hassle considering most projects don't seem to demonstrate this level of variation from the normal PPD on a non-benchmark machine.
In any case, there's nothing you can do to speed them up (minus overclocking your CPU, but that will only make the absolute rate better, not the comparative rate with other projects). It's against F@H policy to skip units that have been assigned to you if you can complete them on time and there's nothing fundamentally wrong with them (i.e. erroring out).
How to block WU 7611
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Re: How to block WU 7611
Thanks for the info, will just have to grin and bear 7611's and watch my points average fall.