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When I render something with blender my CPU is faster than my GPU. Why is that? My GPU is Nvidia Geforce GT730 2gb and my CPU is intel i5

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  • $\begingroup$ This is frustrating 😪 I have a macbook pro but I bought a Lenovo pc with intel i5 and nvidia GPU just for faster rendering but it is not. $\endgroup$ – A7med Dec 4 '15 at 14:23
  • $\begingroup$ This is related and may awnser your question: blender.stackexchange.com/questions/24272/gpu-slower-than-cpu $\endgroup$ – Abel Dec 4 '15 at 14:30
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    $\begingroup$ The blender-internal tag is for the blender internal (BI) render engine. $\endgroup$ – PGmath Dec 4 '15 at 14:51
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    $\begingroup$ No, that's just what that tag on our site is for. $\endgroup$ – PGmath Dec 4 '15 at 14:58
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    $\begingroup$ There is a rendering benchmark on Blenderartists that lists rendering times for different grahics cards and processors. Maybe the spreadsheet can give you some orientation, then you will have to pick one that fits you budget. $\endgroup$ – maddin45 Dec 6 '15 at 18:00
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Increase your tile size.

enter image description here

Your CPU is like Usain Bolt, and your GPU is a lot of turtles. Enough turtles will cover more total distance travelled than Usain Bolt going at full speed within the same time.

Likewise, your GPU will process more pixels at the same time, although slower, so increase the tile size.

You will need to experiment, though, with various values. You will need to find that sweet spot for your GPU and scene. If your values are too high, your GPU might not have enough cores to process an entire tile in one shot, so you might get that lag.

UPDATE

Your GPU has 96 cores running at 700 MHz. This explains why you may not be getting a very big GPU benefit no matter how you tweak the tile size.

In comparison, today's latest budget NVidia GPU is the GTX 950, which has 768 cores, running at a slightly higher 1024 MHz.

I advise you to upgrade your GPU.

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  • $\begingroup$ I did that and it was kinda helpful but the cpu renders 4 tiles while gpu renders only one tile $\endgroup$ – A7med Dec 4 '15 at 21:09
  • $\begingroup$ Did you time your results? You may want to consider either sticking to your CPU or get a new GPU. $\endgroup$ – Mickael Caruso Dec 4 '15 at 21:18
  • $\begingroup$ After increasing the size of the tiles the cpu became much faster than before but the gpu not that difference $\endgroup$ – A7med Dec 4 '15 at 21:33
  • $\begingroup$ GTX 950 , is it the in price and specs? Or is there a better one ? $\endgroup$ – A7med Dec 5 '15 at 5:40
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    $\begingroup$ GTX 950 is around the $135-$160 range. If you're willing to shell out around $500+, you can go for a GTX 980. Also, note that Blender Cycles may now support Radeon cards, but stick with NVidia (my bias). $\endgroup$ – Mickael Caruso Dec 5 '15 at 13:03

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