Lucid Hydra 200: Vendor Agnostic Multi-GPU, Available in 30 Days

[ABXG]

No.
0 card: 0 3dmarks
1 card: 1000 3dmarks
2 card: 1500 3dmarks
3 card: 2000 3dmarks

Adding the first card adds 1000 points adding the second one only adds 500 points, so it's not linear.

This is correct, Hydra could only offer linear scaling if the slope from 1 to 2 cards was equal to the slope of going from 0 to 1 cards.

The form of a linear equation is: y = ax + b, and b would be nearly 0 (not exactly because you could technically run a graphics test on your CPU, but I'll say 0 for simplicities sakes).

For linear performance you would end up with something like:

[Assuming each card added is identical]

cards : 3dmarks
0 : 0
1 : 500
2 : 1000
3 : 1500
4 : 2000

In this case you would have a slope of 500 (slope does not need to be 1 in a linear equation, it just needs to be constant).

Near linear would look something like this:
0 : 0
1 : 500
2 : 999
3: 1498
4 : 1997



Hydra will not offer linear scaling unless it is offering 100% scaling.


*Note - In the following:
0 : 0
1 : 1000
2 : 1500
3 : 2000
4 : 2500

It is a composition of two linear equations:

y = { 0 <= x <= 1; 1000x } { 1 < x < inf; 500x + 500 }

It is linear from 0->1 and linear from 1->inf, but it is not linear from 0->inf.


EDIT screwed up the last equations signs.