One of Apple’s wireless partners is confirming that the new iPhone 3G S indeed sports an embedded ARM processor that’s 50 percent faster that the one employed by its predecessor.

T-Mobile of the Netherlands is amongst the first to publish full specifications for the iPhone 3G S’s processor and onboard memory, noting that the device includes a “600 MHz-processor” and “256 RAM.” The

This revelation appears to confirm a detailed forum post from a Chinese insider that was first brought to light by us early last month. Specifically, it noted that the new iPhone would look identical to the iPhone 3G but feature a 600MHz chip and 256MB of on-board RAM, compared to the iPhone 3G’s 400MHz processor and 128MB of RAM.

As was widely reported a few weeks later, the 600MHz chip was rumored to be based off ARM’s v7 Cortex reference designs, the successor to the ARMv6 chip currently employed in the second-generation iPod touch and iPhone 3G. However, AnandTech is now claiming it’s the same ARM Cortex A8 found in the Palm Pre.

It’s widely expected to be the last iPhone chip to be based off ARM’s broadly available reference designs, with future iPhones expected to include ARM chips with proprietary Apple technology implemented by the company’s recently-acquired team of engineers from P.A. Semi., which are expected to bump up speed even more.