Xeon E3-1230V3 and 5820K...question

[JrClocker]

I have a new system setup running a Xeon E3-1230V3. 4 cores, 8 threads, 3.5 GHz boost.

My main rig is a 5820K. 6 cores, 12 threads, 4.3 GHz overclock.

When I encode a ripped DVD with Handbrake, I get the following encoding speeds:

Xeon: 45 fps (within Ubuntu)
5820K: 250 fps (within Windows)

My question is, why the large speed delta? I would have expected the 5820K system to be 1.845 times faster by:

Core Ratio: 6/4 = 1.5
Speed Ratio: 4.3/3.5 = 1.23

1.5*1.23 = 1.845

However, with this application I am getting the 5820K at 250/45 = 5.56 times faster.

Both are Haswell. Both have 16 GB of memory.

The Xeon is DDR3 at 1600, the 5820K is DDR4 at 2666. Even if I bring the memory speeds into account, that only brings me to 3.07 times faster...not the 5.56 I have observed.

Could it be the quad channel of the 5820K versus the dual channel of the Xeon? According to Intel specs:

Max Memory Bandwith:
Xeon E3-1230V3: 25.6 GB/s
i7-5820K: 68 GB/s

Using this, I get to 4.9 times faster...close, but still not 5.56.

Could it be that the 5820K has 15 MB of cache versus the 8 MB of cache in the Xeon?

Not complaining...just curious! (I'm very happy with the Xeon chip though...especially for the cost!)

 

[ATMINSIDE]

What instruction set are you using on each system?

 

[JrClocker]

Good question...how do you check in Linux?

 

[ATMINSIDE]

I'd suggest you look to see what the program supports in each operating system.