Memory upgrade costs/ types of RAM for MacBook

I want to upgrade a new macbook to 4gb (not the Macbook on my profile which is older). The cost of official Mac memory is about 500 pounds UK. The cost of 3rd party (crucial) is about 100 pounds UK. I know Apple charge extra but the difference seems extreme.
Looking closely at the specs there are some differences, e.g. apple is fully buffered, ECC - but the crucial are unbuffered, non ECC.
Is this a meaningful functional difference, that explains the cost difference? will the cheaper Crucial ones work as well as the apple ones?
Links & info below:
APPLE OFFICIAL
http://www.macwarehouse.co.uk/catalogue/item/A0230258?cidp=Froogle
General
Storage Capacity: 4 GB ( 2 x 2 GB )
Upgrade Type: System specific
Memory
Type: DRAM
Technology: DDR II SDRAM
Form Factor: FB-DIMM
Memory Speed: 667 MHz
Data Integrity Check: ECC
RAM Features: Fully Buffered
Expansion / Connectivity
Compatible Slots: 2 x memory - FB-DIMM
CRUCIAL
http://crucial.com/uk/store/listparts.aspx?model=MacBook%202.2GHz%20Intel%20Core %202%20Duo%20%2813-inch%20White%29%20MB062LL/B
4GB kit (2GBx2)
CT744383 DDR2 PC2-5300 • CL=5 • Unbuffered • NON-ECC • DDR2-667 • 1.8V • 256Meg x 64

ypw wrote:
vasili0s wrote:
Well arn't the available apple memory chipsets ECC and buffered ?
I wouldn't think so. I didn't notice any any additional ICs on my factory installed Hynix modules on my Santa Rosa MacBook. All I saw were the memory ICs and an SPD EEPROM. I can check the part number when I get home, but I'm sure it's non-ECC and unbuffered.
Got it.
Factory installed memory in my Santa Rosa MacBook were two Hynix HYMP564S64CP6-Y5 SODIMMs. Here's the spec sheet from Hynix (may need to cut and paste to a new window/tab):
http://www.hynix.com/datasheet/pdf/module/ds512MDDR2(C-ver)basedSO-DIMMs(Rev0.4).pdf
512MB, 64Mx64, CL5@667MHz, CL-tRCD-tRP of 5-5-5. "Unbuffered" is mentioned at the top, and there's no mention of ECC.

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View Solution.

Hi,
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