Will I see the benefit of adding an ATA/133 PCI Card to my desktop?

I just purchased a Maxtor 300GB HDD that is 7200 RPM and has a 16MB Cache. (For only $80!!)

I have a Dell Dimension 8200 that I want to put it in.  Apparently the drive is capable of 133MB/sec. in Burst Mode, but I'm wondering if I should purchase an ATA133 PCI Card, or just use the onboard IDE.

Which is faster?  Is the PCI interface faster than IDE?  Which has the higher throughput?

Also, some of the PCI ATA/133 Cards I looked at seem to suggest they don't support drives larger than 137GB...  Is this something I need to worry about?

In a related topic, I pose the same questions regarding a USB 2.0 PCI card.  My motherboard didn't support it natively, but if I bought a USB 2.0 PCI, would I still get the full USB 2 speed and throughput?  Where is the bottleneck in the equation?

I assume these are basic questions, but I didn't find any good results when I googled them.

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First, the dell dimension 8200 If i'm reading the docs right has an Intel 850 chipset. This chipset is limited to 100 mb/s on the ide channel here is a diagram of the chipset associations with the motherboard components and speeds http://developer.intel.com/design/chipsets/850/pix/850_800.gif?iid=ipp_850chpst+diag_lg&
Second this card claims support for hard drives larger than 137gb http://www.compusa.com/products/product_info.asp?product_code=305320&pfp=BROWSE
Third this article on your USB question should be answered here http://www.cyberwalker.net/columns/feb04/upgrade-to-usb-2.htm

To wrap it all up, the pci card will help you attain the 133mb/sec rating for the hard drive, the newer card do support 137gb and larger drives ,but do your homework when purchasing to make sure. And you can upgrade an older computer to  USB 2.0 with an addon pci card.

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Gary CaseRetiredCommented:
Good price !!

Sparkmaker answered your questions -- I'll just add a couple of thoughts:

First, if you do want to buy an add-in card, this works great for about 40% less than the card above:

However, if you have a spare onboard IDE channel I would just use it.   The burst transfer rate will be a bit slower (UDMA-5 vs UDMA-6 => or 100mb/sec vs 133mb/sec) but that will make VERY LITTLE difference in the performance you'll see.   That rate only occurs when transferring data to/from the buffer on the drive.  The drive only spins at 7200rpm, which means it's maximum sustained data rate will be between 30mb/sec and 60mb/sec (at the inner and outer cylinders) ==> both of which are well below UDMA-5 (100mb/sec) transfer rates.   In real life applications there is very little difference between a UDMA-5 and UDMA-6 hard drive.   The more important aspects of a hard drive are average access time, average latency (which is simply a function of rotation speed), and the rotational speed of the platter (which determines how fast it can actually provide data -- to either the buffer or the interface).

As for USB 2.0 -- ABSOLUTELY add a card for this.   In this case it's a 40x improvement in transfer rates for very little money.   Some cards work better than others -- I recommend this one:  http://www.newegg.com/Product/Product.asp?Item=N82E16815124008
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