Is this modular? At the top it reads semi-modular and below it reads modular,, which is it and what is the difference?

It is semi modular. Semi modular means that that necessary plugs are not removable, but the optional ones for hdds, psu, etc come removable.

How long are the primary cables? Need to reach around a large video card in a big case.

Joe, it's been a few months since I assembled my system but, as I recall, the cable lengths were all very generous. I don't think this should be a problem for you with this PSU. A big plus is all the variety of cables and connectors that are included with this unit. Very versatile package that was highly recommended to me by a serious "techie" at Tiger Direct. I took his advice but made my purchase here.

I need two 8 pin connectors and a 4 pin connector (in addition to the main mobo power) does this psu support that?

Yes it does, I don't know why the manufacturer would be trying to talk you into a more expensive power supply here at all.............. *rolls eyes. If you look at the specification sheet under the CX-M 550w, it does in fact have 2x 6+2pin PCIe cables (so two 8 pins), and it also has a 4+4 pin (4 or 8 pin) for the CPU connector, as well as the regular 24pin connector. The unit is capable of 550w, and the connectors you're decribing are probably around a 350-450w system during heavy usage as a rough guess (dual 8pin says probably a 200-250w GPU, single 4pin CPU connector tells me 65w TDP CPU). You'll find most PSU's these days will have that arrangement at minimum (plus other cables) if they're of any good quality. This PSU will work great on your system, and should be a solid purchase. (I'm buying one myself on payday).

The SATA plugs are too thick and don't fit my case's floor bolted SSD. What do I do now? There's no alternate mount for the SSD drive.

First of all change your username, I don't care how uber your shmekel is. Second, get a 2.5" to 3.5" converter (to mount in the regular hard drive slots and not the floor).Here is one I have bought previously:http://www.amazon.com/gp/product/B002BH3Z8E/ref=wms_ohs_product?ie=UTF8&psc=1Other options:http://www.amazon.com/Notebook-Drive-Mounting-Bracket-Adapter/dp/B00AYJFXIQ/ref=sr_1_13?ie=UTF8&qid=1380143869&sr=8-13&keywords=2.5%22+to+3.5%22http://www.amazon.com/2-5-inch-Drive-3-5-inch-Plastic-Adapter/dp/B0061GEORW/ref=sr_1_8?ie=UTF8&qid=1380143869&sr=8-8&keywords=2.5%22+to+3.5%22http://www.amazon.com/Kingwin-Inch-Internal-Drive-Mounting/dp/B0064VP70W/ref=sr_1_2?ie=UTF8&qid=1380143869&sr=8-2&keywords=2.5%22+to+3.5%22

Brand	Corsair
Product Dimensions	14.99 x 13.97 x 8.59 cm; 453.59 g
Item model number	CP-9020101-NA
Manufacturer	Corsair
Series	cx series
Colour	Black
Form Factor	ATX
Voltage	120 Volts
Wattage	450 watts
Are Batteries Included	No
Item Weight	454 g
Guaranteed software updates until	unknown

Corsair CX Series 450 Watt 80 Plus Bronze Certified Modular Power Supply

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