intel(R) Pentium(R)4 cpu 1.80GHz (2002 vision) can ugrade to how many ram

512MB RAM is required,but no more than 1GB according to the capability
of this old-fashioned CPU which was provided before the year 2003.

The word "RAM" is a proprietary noun ,which is uncountable.You should say"how much" instead.
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What a waste if you upgrade up to 2GB+ RAM for this CPU,although the maximum RAM space it can support is 3.25-3.5GB.

P4的1.8G有两种：一种威廉核心，L2是256K；一种是北木核心，L2是512K。

提问都有语法错误…