This got me thinking. How would the PPL compare to a unit capable of taking SLI GPUs? Well, I found a case with at least 4 external PCI slots (for 2x 2 PCIe x16 cards using double-width), with SFX PSU so able to be bumped up as necessary.
Then I looked up the Heaven Extreme benchmark leaderboards, and since I don't have a CPU to test this with, and I'm trying to pose a realistic scenario, I took the first entry that uses a readily-available CPU that is present in the CPU-Z benchmark reference set, namely, i7-7700K. I also decided not to look at units with extreme cooling since that would likely increase the volume outside the case, and therefore not qualify under the case volume alone, and since I don't know alll of the cooling methods they have listed, I chose Air cooliing only category since we can be sure these will be case-mounted.
So, i7-7700K reference score (o/c to 4.2Ghz) in CPU-z =
2648
Heaven Extreme benchmark score with 2x 1080 Ti =
8667
The case, a Chieftec UE-02B, comes in at 300mm x 105mm x 410mm giving it a volume of
12.9L; so "Hypothetical PPL Score" is
1,779,087 - Hypothetical User - i7-7700k - 2x GTX 1080 TI - (2648 * 8667) / 12.9L
Now, I did find another score (for the same CPU) with a single GPU using LN2, scoring 11129 with a Titan XP; and a uATX case with SFX PSU and 2 PCI slots for a single GPU coming in at 9.76L; applying the same parameters would give a score of
3,043,843, although there are doubts whether that case would hold the cooling unit he used so let's call this one a philosophical value.
So there's a nice exercise, puts the SFF PPLs into context I guess..
