All models of the first generation iPad have 256 MB of RAM (random access memory). This is the same amount of memory found in the iPhone 3GS.

The RAM inside of the iPad is not removable or upgradeable. Apple has increased the amount of RAM in the iPhone 4 to 512 MB.

Though it comes as no surprise, we've gotten emails from a number of readers who received an iPad with dead pixels and we've read about many more around the web. This comes with the territory, dead and stuck pixels are a reality of LCD technology. Different manufacturers have different policies on what constitutes an unacceptable number of dead or stuck pixels, and thus at what point the product in question is exchanged as defective. So where does Apple stand on the iPad?

Apple has no definitive guidelines on what they consider an egregious number of dead or stuck pixels on any of their products. However, Apple has traditionally been very fair and balanced when it comes to warranty exchanging their products due to customer complaints about dead or stuck pixels -- especially in the case of the iPhone. Chances are, the iPad is no different.

So how do you check to see if your iPad has dead or stuck pixels? We've put together an altogether un-fancy, but terribly simple way to check your iPad for dead or stuck pixels.

Only the Wi-Fi + 3G models have assisted GPS (Global Positioning System) to facilitate Location Services. Assisted GPS works by using location information from the AT&T data network to speed up the acquisition of GPS satellites. Many apps use a GPS receiver to determine where the iPad is located.

So far, 40 applications have been certified by Apple as iPad 3G-only compatible.

Wi-Fi only models include a digital compass, but lack the internal hardware to pick up radio signals from GPS satellites and land-based cell towers.

The subscriber identity module (SIM) card installed in the 3G-capable iPad models is a micro-SIM. The micro-SIM or 3FF (third form factor) card has the same embedded hardware and contacts as other SIM cards.

The difference is that the micro-SIM is cut down to a smaller size. The SIM cards we are most familiar with in mobile phones today are actually mini-SIM cards. The iPad's micro-SIM card is approximately half the size of the iPhone's mini-SIM card.

Five Bluetooth profiles are supported in iPhone OS 3.0:

Advanced Audio Distribution Profile (A2DP)
Audio/Video Remote Control Profile (AVRCP)
Hands-Free Profile (HFP 1.5)
Personal Area Network Profile (PAN)
Phone Book Access Profile (PBAP)

The iPad currently supports Bluetooth 2.1 + EDR and runs iPhone OS 3.2.

Bluetooth 2.1 + EDR is backward compatible with 1.2 and supports data transfer speeds up to 3 Mbit/s. Features of this specification include:

Extended inquiry response (EIR)
Sniff subrating
Encryption pause/resume (EPR)
Secure simple pairing (SSP)