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Hi Adriano, 
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very interesting..........no wonder I'm seeing longer renders with 2.64 vs 2.63. 
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Will do more tests with different versions. Just got a new (used) Zotac GTX580
<br/>and will test different tile settings. 
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Thanks, 
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Cal
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<br/>On November 7, 2012 at 7:02 PM Adriano Oliveira <adriano.ufrb@gmail.com> wrote:
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<p style="margin-bottom: 0.0001pt;"><span style="font-size: 12pt; font-family: Arial,sans-serif;">Hi,</span></p>
<p style="margin-bottom: 0.0001pt;"><span style="font-family: Arial,sans-serif; font-size: 12pt;">Subdividing render image in tiles has very inconsistent behavior in CPU and GPU: more tiles are good for CPU, BUT less are better for GPU.</span></p>
<p style="margin-bottom: 0.0001pt;"><span style="font-family: Arial,sans-serif; font-size: 12pt;">With my i7, 8x8 is ok. With my GTX 560 Ti, 1x1 is the best. With another dual GTX 590 system, I've found 3x3 to be fastest...</span></p>
<p style="margin-bottom: 0.0001pt;"><span style="font-family: Arial,sans-serif; font-size: 12pt;">Problem: with 8x8 as default, non-advised GPU users are experiencing longer render times.</span></p>
<p style="margin-bottom: 0.0001pt;"><span style="font-family: Arial,sans-serif; font-size: 12pt;">In last builds, tiles became pixel based, what is not good for GPU users, as long as we should now set it up for equal image size and this can change a lot for preview. And as strange as it gets, I’ve found that tile size of 1920x1080 is fast even for a 960x540 render…</span></p>
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<p style="margin-bottom: 0.0001pt;"><span style="font-size: 12pt; font-family: Arial,sans-serif;">I think this is getting messy.</span></p>
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Adriano A. Oliveira
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<br/> 
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