EDITED - Changed link to the correct transaction (like I said, I was tired).

I'm in the middle of a dispute with a bitcoin supplier who have sent me a txn with what I believe to be a too low fee. I wanted to ask the community for their thoughts.

In short, this 1550 byte txn was sent with a 0.0002 BTC fee:
https://blockchain.info/tx/5b842d282c2086add3dc3eaa9f5d0f8d05a8056c16703b54607a3a635e43960e
it's been pending for 32 hours now when other txns with what I believe to be correct fees are being included in a couple of blocks.

Accoding to bitcoind's estimatefee, for a:
1 block confirm the fee is 0.00048871 BTC per kb
6 block confirm the fee is 0.00024609 BTC per kb

So, I suspect for a 1550 byte txn, the fee should be between 0.00038143 BTC and 0.00075750 BTC - so from 2x to 4x the actual fee used.

However, the exchange feels differently - here is there response in what is now a long email exchange:
 "As a bitcoin developer, you'll know that the minimal bitcoin fee is calculated based on transaction size, not cardinal number of inputs or outputs. Looking at the specs, you'll see that for a 1.55KB transaction, 1mBTC would be perfectly acceptable, and yet, we pay 2mBTC. That's why you'll notice that the blockchain.info page is showing this a "high priority"."

He says 2mBTC, but surely he means 0.2 mBTC?

Are my calculations wrong here? Sorry for the possibly dumb questions - I've not had much sleep the past 24 hours....

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I've currently got 4x 5870's in a rig, each connected using a modified 1x PCI-e extender to a GA-770T-D3L motherboard. PSU is a 1000watt Coolmaster SilentProM and is showing sub 650watt currently.

3 of them are connected into a 1x PCI-e slot and are recognised with lspci and run poclbm happily enough.

1 of them is connected into a 16x PCI-e slot. This does not show up with lspci.

I've not done much more investigation on this, but I was wondering, is using a 1x PCI-e extender from a 16x slot to a 16x card possible? I was sure it was. Is the motherboard being picky about the type of card in the slot?