Memmory rip off?

When I bought my K-x the salesman in Jacobs advised me that I would need a fast memory card and sold me 15mb/s Sandisk Ultra SDHC 8gig for just under £30.
My daughter bought a Sandisk SDHC 8gig at Asda today for £13 which set me wondering.
I set the camera to "sport" mode and fired off ten consecutive shots with the expensive memory loaded in the camera, it took 8 seconds before I could start to view the pictures in camera.
Again with same settings I inserted the cheaper card and fired off ten shots and again, it took exactly the same time - 8 seconds before I could view the pictures.
Presumably there must be some difference in the cards and I am wondering if the faster card is perhaps limited to the cache within the K-x itself.
Or, as I suspect, It is just a rip off for a camera at this level as the cheaper 5mb/s cards appear to be quite adequate.

There are a lot of variables with memory cards.

A Sands Ultra isn't that fast a card anymore. Reading back after shooting in continuous is often slow as the buffer has to empty first.

The other things you also pay for are reliability and warranty. I have had lots of 'cheap' miniSD and microSD cards fail but never a Sandisk Extreme card. Ultra cards are held in high regard as well.

I use Integral Ultima Pro 16Gb Class 10 cards and never had any problems with them. £19 each ( apart from PLay.com which absurdly charges £68 for them!!! )

Best advice is from pictstop - good prices too

NINETEEN POUNDS - now thats sounds attractive - where from?

http://www.mymemory.co.uk/SDHC/Integral/Integral-16GB-Ultima-Pro-SD-Card-%28SDHC%29---Class-10

I ordered two from that place through Ebay. £19.04 each they cost me a few weeks ago.

Thanks - that's a good site

Choosing An SD Card might help.

And I too use MyMemory for their prices and service.

I'll second the recommendation. For the last 3 years or so I've used only Integral Ultima Pro cards for everything I use memory cards for including DSLR, compact camera, mp3 player, PDA (though I don't use one any more). They are fantastic value for money compared to other (reliable) brands and I have never had a single problem with one, though I have had problems with other brands in the past, even the much praised SanDisk.

BTW MyMemory also sell them through Amazon which is where I get them from because of the convenience of using my Amazon account. http://www.amazon.co.uk/Integral-16GB-UltimaPro-SDHC-Class/dp/B003ZDNLIW/ref=sr_1_1?ie=UTF8&s=computers&qid=1299973009&sr=8-1

Get the fastest you can afford. The quickest Sandisk seem to be:

http://www.7dayshop.com/catalog/product_info.php?cPath=777_6&products_id=111093

or if you want something a bit cheaper:

http://www.mymemory.co.uk/SDHC/Integral/Integral-Endurance-8GB-SDHC-Memory-Card-...

I did some casual "testing" of some SD cards I have, results here:

link

Vic.