Basically they do. As stated, they both have the have the same basic processor, but the optimus had a separate 400 mhz modem processor along with a 200 mhz graphics processor. This actually frees up the main chip and allows the phone to run smoother and helps to prevent lag and freezing. Check out the review on phonedog for the prevail and click the link where they talk about phones that are better than the prevail.
I watched several pertinent reviews. Good information. I knew the optimus had a gpu though did not know it had a modem processor, I can see how that helps tremendously.
I would not consider the MSM7627 a dual core chip. A multi-core processor is a single computing component with two or more independent actual processors. If you go with common industry practice, it's a single core chip because it's only got one application processor, a modem processor only runs the modem, and the graphics processor only runs the display. If a processor is only specialized for the modem or graphics, I wouldn't consider it a Central Processing unit but a specialized processing unit.
Take AMD Fusion chips for example. They have two processing cores and a Radeon GPU yet the chips are called dual-core not triple core.
On a side note, the Prevail bested the Optimus V in all but one of the benchmarking test conducted by PC magazine.
No I dont think it is a dual core by any means, just like in your home computer you have the cpu and then the gpu so a phone like the prevail that uses the cpu to do all the work instead of offloading to other processors it is going to cause some problems. I think it would be nice if they did do offloading like that. Oh well I have already bought it, Should receive it next week. I bought mine for one very important detail. 3G, a smart phone that has such a limited data path is not very smart as far as im concerned.
My metropcs phone is fine when im at home and have wifi, or at a few places where wifi is available, though most have censored access. If im at home I can use my phone but for anything I really need its just as easy, or even easier to look it up on my computer. However when im out, grocery shopping, or traveling and I want to look something up, price of items for example or maybe the best deal on hotels that 1x kills me. 3+ mins to load google, not to run a search but to load the home page.