Okay, I'll do some counteract to counteract the ARM FUD.
Do you mean that OMAP doesn't have PCIe, real memory interfaces (what do you mean by "real memory interface"? Is there something like a "fake" memory interface?") SATA controllers, etc. etc. etc. Sorry, but they DO HAVE THEM. Plus, the OMAP 4 series has a GPU, video encoder/decoder, its own 2D accelerator and whatever interface it requires to create a smartphone. Guess what will happen if the OMAP lacked all that stuff?
So, maybe it can be a Intel vs. TI issue, but it it certainly isn't an Intel vs. ARM issue. If you want to be fair, you should compare Intel Ivy Bridge with an SoC without the smartphone-or-tablet-or-whatever specific devices, which is manufactured in a recent-enough manufacturing process. Unfortunately, as of now, I fail to find any SoC intended to be used on datacenters.
Yes, you are an idiot to create a datacenter with an array of OMAP 4s. Maybe the Qualcomm S4 may be better (28nm process) but I don't think it is likely to beat Ivy Bridge for now (due to inefficient SoC-to-SoC interconnects - Ethernet wasn't designed to be used for close proximity high-speed/low-power communication). But claiming x86 is more power-efficient than ARM is a completely different issue that can't be resolved by comparing OMAPs and Ivy Bridges.