Powernow must have been enabled. It controls your CPU speed dynamically to conserve battery and heat output. Thats the reason your cpu clock speed is reading 994MHz. It should go up to full speed as and when needed. The lower amount of RAM is probably due to the memory being shared with your graphics card, since the graphcis card does not have its own memory it uses system memory instead.
. It is a much more accurate program to determine your CPU speed and amount/type of memory.
HP Pavilion TX2500..AMD Turion X2 Ultra ZM-86, 3GB DDR2 800, 320GB 5400rpm SATA, ATi Radeon HD3200/M780G.