GeForce GTX TITAN Blacks in 4-Way SLI vs GeForce GTX TITAN Zs in Quad SLI?

[Tiger Minecraft]

How would 4 TITAN Blacks stack up against 2 TITAN Zs? Looking solely at price, the TITAN Zs *should* win, considering they will drop you $6K instead of the Black's slightly less expensive $4.8K. However, looking at GPUs, they are both tied, and looking at clock... gotta give that one to the Blacks. SO, does anyone have any real-world evidence (yes, that means PassMark is invalid) that one is better than the other, and if so, using what tests?

 

[17seconds]

Hardwareinfo.com has a TitanZ SLI article up.
http://us.hardware.info/reviews/5419/nvidia-geforce-gtx-titan-z-sli-review-incl-tones-tizair-system

 

[Tiger Minecraft]

Anyone else want to share their opinion?

 

[joselo025]

4 way sli black titan will destroy the quad slid titan z why? simple

titan z clock speed: 889MHz

Single titan black speed: 1000mhz

so yeah, the 4way sli would destroy the quad sli titan z and is 2000 dollars cheaper

 

[Tiger Minecraft]

4 way sli black titan will destroy the quad slid titan z why? simple

titan z clock speed: 889MHz

Single titan black speed: 1000mhz

so yeah, the 4way sli would destroy the quad sli titan z and is 2000 dollars cheaper

But what about in double-precision circumstances? I ask this because "[The GTX Titan Z's] double-precision (64-bit) floating point GPGPU performance has not been artificially capped, just as was the case for the GTX Titan and GTX Titan Black."