I am wondering why the render time on a new build desktop is slower than my old laptop.

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kurthalamue

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Nov 30, 2015
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I have just rendered the same file three times in three different places and do not understand the resulting times.

New Desktop with the file saved on the SSD: 5 min
New Desktop with the file saved on the HDD: 32 min
Old Laptop only has HDD: 28 min

How could this be? Below are the specs for the New Desktop and as best I can figure for the Old Laptop

New Desktop:
CPU: Intel Core i7-5820K 3.3GHz 6-Core Processor ($374.99 @ SuperBiiz)
CPU Cooler: CRYORIG R1 Universal 76.0 CFM CPU Cooler
Motherboard: ASRock X99 Extreme4 ATX LGA2011-3 Motherboard ($184.98 @ Newegg)
Memory: G.Skill Ripjaws 4 series 16GB (2 x 8GB) DDR4-2400 Memory ($74.99 @ Newegg)
Storage: Samsung 850 EVO 500GB M.2-2280 Solid State Drive ($177.99 @ Amazon)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($49.98 @ OutletPC)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($49.98 @ OutletPC)
Video Card: Asus GeForce GTX 970 4GB STRIX Video Card ($318.49 @ SuperBiiz)
Case: Phanteks Enthoo Pro ATX Full Tower Case ($79.99 @ Newegg)
Power Supply: EVGA SuperNOVA GS 650W 80+ Gold Certified Fully-Modular ATX Power Supply ($69.99 @ Newegg)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($15.99 @ Newegg)
Monitor: Asus MX279H 27.0" Monitor ($229.99 @ Micro Center)

Old Laptop:

Intel Core i5 480M @ 2.67GHz Arrandale 32nm Technology
4.00GB Dual Channel DDR3 @532MHz (7-7-7-20)
Sony Corp Vaio Mother Board
Graphics: Digital Flat Panel 512MB ATI AMD Mobility Radeon HD 5000 Series
(2) 465GB Seagate ST9500325AS (SATA)
 
Solution
geofelt
ssd vs. hdd is easily explained by the difference in speed of the two types of devices.
Moreover, there will be a big difference if the input files and outputs are on the same device.
It matters little with the ssd which has negligible latency.
On a hard drive the latency will kill you if input and output are on the same device.

The good performance of the laptop is harder to explain.
One possibility is that the rendering is not as cpu dependent as we might think.

I seem to recall that there are some specialized capabilities of that generation of cpu that can help such apps.

For best performance options, look to the user forums of the app you are using.

And, consider the added performance of the MVMe pcie type devices such as the...
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kurthalamue

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Sorry I should I put that. I am rendering an interior scene, some glass, only GI lighting using Rhino 5 and Vray for rhino 1.5.
 
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geofelt

geofelt

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Oct 9, 2006
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ssd vs. hdd is easily explained by the difference in speed of the two types of devices.
Moreover, there will be a big difference if the input files and outputs are on the same device.
It matters little with the ssd which has negligible latency.
On a hard drive the latency will kill you if input and output are on the same device.

The good performance of the laptop is harder to explain.
One possibility is that the rendering is not as cpu dependent as we might think.

I seem to recall that there are some specialized capabilities of that generation of cpu that can help such apps.

For best performance options, look to the user forums of the app you are using.

And, consider the added performance of the MVMe pcie type devices such as the Samsung 960 PRO.
 
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