What's better for seti dual nvidia titans or 64 core amd opterons [/list]

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My WAG is CUDA.

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What's better for seti dual nvidia titans or 64 core amd opterons [/list]

The GPUs out-produce the CPUs 10-20:1. You do have-to-have enough "cores" to be able to free resources to feed the GPUs.

Being VERY general, even ridiculously general, you need to have a "core" available for each GPU work unit you plan to run at one time. (that's wrong, but instructional)

A dual 780 with i7-3930k
(ht on, use 50% of the processors i.e.6 cores out of 12, 3 AP or 2 MB per GPU, 6 AVX AP or 6 SSE2 MB on CPU)
does like this
http://stats.free-dc.org/stats.php?page=hostbycpid&cpid=67e941fb0199bcf114f251c2426acc37

Look at the graph showing daily results.

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To overcome Heisenbergs:
"You can't always get what you want / but if you try sometimes you just might find / you get what you need." -- Rolling Stones

With an i5 quad core running those cards you should do well, miles better than those Opterons and you'll find that you'll crunch more while using much less power.

If you only do MB's then reserving a core won't be necessary unless you plan on running more than 3 on each card. Of cause YMMV.

But if you are running AP's on video card then you'll need to reserve a core per each AP running, some people reckon that you can get away with a 0.5 CPU setting but they are few and far between as most will tell you a whole core (I can't comment personally as I only do AP's on CPU).

If you want to run 2 AP's per card then you might want to consider an i7 (an i5 might be a laggy bottleneck here for you), but remember the extra cores arn't real 1's so some experimentation maybe needed here as to how many cores need to be set aside (and likely you'll need at least 1 core free to feed both cards 3 MB tasks workunits each, again YMMV).

AMD CPU's tend to use much more power than Intel's presently with a much lower production number per watt, 1 waits to get attacked on this but stats don't lie.

If you do use an AMD CPU then remember that the latest 1's that contain 2 cores per CPU module act very similar to hyperthreaded Intel cores ( more cores many need to be freed).

Earlier AMD CPU's that run proper cores are like Intel's i5's though they still use much more power for less productivity than Intel's breed.

Don't get me wrong as 7yrs ago I only had AMD CPU's (I still try the odd 1 now and again), but presently Intel are way on top for performance and total cost of running over 12 months (I do wish that AMD gets its act together again).

Check this rig of mine out, http://setiathome.berkeley.edu/show_host_detail.php?hostid=5712423, but remember that I only do MB tasks on those 2 GTX660's (3 at a time) while I try to keep all the 3570's cores occupied by AP tasks (the same goes for my other rig).

But again, YMMV depending on a lot of other things so only take this as a rough guide and it doesn't take in your own usage of this future rig.

1 more thing is that a 2nd hand core i7 setup on the 1366 or 2011 might work for you too, but they also come with a larger power usage.

Cheers.