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
Asked
Active
Viewed 2,497 times
3
-
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. – A7med Dec 04 '15 at 14:23
-
This is related and may awnser your question: http://blender.stackexchange.com/questions/24272/gpu-slower-than-cpu – Abel Dec 04 '15 at 14:30
-
What rendering engine are you using? – PGmath Dec 04 '15 at 14:49
-
@PGmath I'm using cycles render – A7med Dec 04 '15 at 14:50
-
2The [tag:blender-internal] tag is for the blender internal (BI) render engine. – PGmath Dec 04 '15 at 14:51
-
So you mean it works only with blender render ? – A7med Dec 04 '15 at 14:53
-
1No, that's just what that tag on our site is for. – PGmath Dec 04 '15 at 14:58
-
If I read the specs correctly, the GT730 is a pretty slow graphics card. It provides hardware acceleration for multimedia applications ("super-fast web browsing, plus incredible photo and video editing") but it is not meant for high performance calculations. They compare it to integrated graphics, which is like comparing a Smart to an old VW Beetle, while everyone else is driving Ferrari. – maddin45 Dec 04 '15 at 23:35
-
That explains a lot. I have never read its specs all I know that it is 2 gb. Now I know that I have to change it. Any recommendations? – A7med Dec 05 '15 at 05:38
-
1There 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. – maddin45 Dec 06 '15 at 18:00
1 Answers
1
Increase your tile size.
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.
Bernardo Sulzbach
- 103
- 4
Mickael Caruso
- 166
- 6
-
I did that and it was kinda helpful but the cpu renders 4 tiles while gpu renders only one tile – A7med Dec 04 '15 at 21:09
-
Did you time your results? You may want to consider either sticking to your CPU or get a new GPU. – Mickael Caruso Dec 04 '15 at 21:18
-
After increasing the size of the tiles the cpu became much faster than before but the gpu not that difference – A7med Dec 04 '15 at 21:33
-
-
1GTX 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). – Mickael Caruso Dec 05 '15 at 13:03