HASH

Hi all.

Is the speed of hash operations stands on the performance of CPU?
Below you can see part from output of explain analyze command

*Intel(R) Xeon(R) CPU E7520 @ 1.87GHz*
" -> Hash (cost=337389.43..337389.43 rows=3224443 width=34)
(actual time=15046.382..15046.382 rows=3225191 loops=1)"
" Buckets: 524288 Batches: 1 Memory Usage: 207874kB"

*Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz*

" -> Hash (cost=340758.94..340758.94 rows=3191894 width=34)
(actual time=2692.878..2692.878 rows=3192103 loops=1)"
" Buckets: 524288 Batches: 1 Memory Usage: 205742kB"

*Intel(R) Xeon(R) CPU E5-2650 0 @ 2.00GHz*
" -> Hash (cost=337389.43..337389.43 rows=3224443 width=34)
(actual time=8559.849..8559.849 rows=3225293 loops=1)"
" Buckets: 524288 Batches: 1 Memory Usage: 207881kB"

*Intel(R) Xeon(R) CPU E5-2630 v3 @ 2.40GHz*
" -> Hash (cost=356613.23..356613.23 rows=3224623 width=40)
(actual time=3635.931..3635.931 rows=3224623 loops=1)"
" Buckets: 524288 Batches: 1 Memory Usage: 207838kB"

Thanks.