Buying from Ebay is it worth the risks?

I need to upgrade my Dell Pc 4550 Fsb 533mhz purchased Jan 2003 with an
extra 1 GB RAM (256Ram installed currently)

and my Packard Bell Laptop R 8750 12 months old by 1 GB RAM too
(512Ram installed currently)

Is buying from Ebay worth it could I wreck my Pc by installing substand
memory thats assuming I am sold Counterfeits or Fakes which I am told
have poor quality rating?

The seller on ebay has 100% feedback and is a powerseller.

I realise I will not have a 12 month gaurantee if I buy on ebay too.
****************************************************************************************************
Heres what Crucial UK
will be charging me

Remove Part No. CT563555 512MB, 184-pin DIMM Upgrade for a
Dell
Dimension 4550 (533MHz FSB) System £37.99 Quantity 2
£75.98

Remove Part No. CT6464X335 512MB, 200-pin SODIMM Quantity 2
£37.99
£75.98

Subtotal £151.96

Shipping Charge £5.00

VAT calculated at 21% for Ireland: £32.96

Estimated Total £189.92 (UK Sterling Currency)
(Click to recalculate basket if changes are made.)

Any suggestions? has anyone on here purchased memory on Ebay and been
happy?
I keep getting
windows crashing intermitently despite having fast dsl broadband 2megs
per second
what can I do besides upgrading extra memory to improve pc performance.

I was told by Crucial USA that the average system ram to have in a
computer is 2 GB this seems like a massive amount was he just saying
this to increase sales of the Memory he was selling:)?

Regards

Sandra

.

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