<core_client_version>6.12.22</core_client_version>
<![CDATA[
<stderr_txt>
<search_application> milkywayathome_client separation 0.57 Windows x86 double CAL++ </search_application>
Found 1 CAL devices
Chose device 0

Device target:         CAL_TARGET_CAYMAN
Revision:              1
CAL Version:           1.4.1353
Compute shader:        CAL_TRUE
Engine clock:          880 Mhz
Memory clock:          1375 Mhz
GPU RAM:               2048
Wavefront size:        64
Double precision:      CAL_TRUE
Compute shader:        CAL_TRUE
Number SIMD:           24
Number shader engines: 2
Pitch alignment:       256
Surface alignment:     4096
Max size 2D:           { 16384, 16384 }

Estimated iteration time 100.952296 ms. Dividing into 4 chunks
Integration range: { nu_steps = 640, mu_steps = 1600, r_steps = 1400 }
Using { 1, 4 } chunk(s) of size { 1400, 400 }
Integration time = 67.577636 s, average per iteration = 105.590057 ms
Integral 0 time = 68.841878 s
Estimated iteration time 25.238074 ms. Dividing into 1 chunks
Integration range: { nu_steps = 640, mu_steps = 400, r_steps = 1400 }
Using { 1, 1 } chunk(s) of size { 1400, 400 }
Integration time = 16.850805 s, average per iteration = 26.329383 ms
Integral 1 time = 17.182738 s
Likelihood time = 5.379981 s
<background_integral> 0.000307098551866 </background_integral>
<stream_integral>  92.501700702443955  1736.205884928765300  205.779079529715720 </stream_integral>
<background_likelihood> -3.062120835651964 </background_likelihood>
<stream_only_likelihood>  -5.882912009451230  -4.498048808511908  -3.984207272741599 </stream_only_likelihood>
<search_likelihood> -2.826061513869698 </search_likelihood>
08:37:16 (444): called boinc_finish

</stderr_txt>
]]>

Looks like I'm buying the HD 6970 then.

nVidia: software limitation (cripples hardware) 1/8 FP32
AMD: hardware limitation (though not crippled) 1/5 FP32

An application that will work with ATI/Linux is coming.