Is this the CPUZ snip from the laptop in your 'System Specs' ?
It says Acer and you mentioned Sony.
DDR2 RAM gives you twice the frequency, 533 X 2 = 1066 MHz
According to the snips your RAM is running at 1066 MHz.
It is strange that CPUZ isn't showing the SPD info for slot#2.
Memory tab is showing you what is in the computer.
SPD tab is just a list of the manufactor's published specs for that RAM, the timings at different speeds/frequencies.
The RAM can be ran at different speeds and timings than is listed in the SPD tab.
I would go with the info in the Memory tab.
Try another RAM info app like
RAMMon by PassMark.
Post a snip from it, so we can see if it is different.
Let us know if you have any other questions.