weird performance

[xaver1002]

Hello guys!

I am wondering if you can help me. I have two work computers; one desktop and laptop for portability. Last month I upgraded desktop computers GPU with GTX 1080 in hopes of getting better RT performance from Vray RT.
My exact specs are:
Desktop: i5-4670K (overclocked to 4.4GHZ), 8GB of DDR3 ram 1866MHZ, Aorus GTX 1080 OC
LAptop: Asus Strix GL502VS, i7 7700HQ 3.4 GHZ, 16GB of DDR4 RAM 2133MHZ, GTX 1070

Thing is, GTX 1080 in my desktop should be outperforming GTX 1070 in my laptop in Vray RT CUDA, but it is not. For example, I was rendering same scene on both computers and laptop with 1070 took 3 minutes, while desktop with 1080 took allmost 7 minutes. Both were rendering with vray RT on CUDA, with same resolutions and other settings.
My nvidia drivers are latest and I use vray 3.5 for 3ds max.

What could be problem here? Or it is just that my desktops other hardware is simply too old and is bottlenecking my 1080 (which is running at 100% usage while rendering).

Thanks

[xaver1002]

Sorry I screwed up, after registering vray section didnt show up, can mod please move this under RT topic?

[svetlozar.draganov]

Can we see some logs from the rendering from both machines?
Render settings and outputs from both machines would be also very helpful.
Have you tried to run some benchmark software like 3DMark, which is the fastest card?
What about V-Ray Benchmark, which cards is faster?