On paper, the Capstone isn't all that different from the V750. Active PFC, Japanese capacitors, dynamic fan control, and 80 Plus Gold certification are all part of the program. The Capstone even has the same 62A capacity on its lone 12V rail.
There are a few notable differences between the two units, though.
For starters, as we mentioned, the Capstone is about nine tenths of an inch longer, at 6.4". As a result, it won't fit in quite as many enclosures as the V750. The Capstone does put that extra bulk to good use, though, with a larger, 140-mm fan. That larger fan could translate into lower noise levels, since it should be able to dissipate the same amount of heat as the V750's 120-mm spinner with fewer rotations per minute.
The Capstone also has a slightly different connector arrangement. While the motherboard leads are hard-wired, the PCIe ones are not. (You still get four 6+2-pin connectors.) Rosewill unit provides five 4-pin Molex connectors instead of six—which is worth noting if you have auxiliary fan controllers and stacks of old hard drives—and its cables aren't quite the same length as the V750's. More on cable lengths in just a minute.
For now, we'll note that the Capstone-750-M sells for a little more than the V750, at $109.99. Rosewill does cover this unit with a seven-year warranty, though, which is two years longer than Cooler Master's coverage. Seven-year warranties are more typically found on high-end units from companies like Corsair, so it's nice to see Rosewill offering the same perk.
Before we get into more serious testing, let's quickly compare the cable lengths of our power supplies. Nobody wants a PSU with needlessly short cables, especially when building a PC inside an extra-tall enclosure.
Here are the figures for the most critical connector types: motherboard, auxiliary 12V, PCIe, Serial ATA, and 4-pin Molex. In all cases, we measured the length from the body of the power supply to the end of the connector. We measured the distance to the last connector for the Serial ATA and Molex leads, since drives and fans can be connected individually with multiple leads; but we measured up to the first and last connectors for the PCIe leads, since many graphics cards require two power connectors in the same location. (The Silencer 760W has a single PCIe connector per lead, so that last part doesn't apply to it.)
|Motherboard||59.0 cm||59.5 cm||51.0 cm|
|Auxiliary 12V||65.5 cm||64.0 cm||62.0 cm|
|PCIe (first plug)||55.4 cm||48.0 cm||61.0 cm|
|PCIe (last plug)||65.0 cm||59.0 cm||N/A|
|SATA (last plug)||86.5 cm||88.0 cm||105.5 cm|
|Molex (last plug)||74.0 cm||74.5 cm||106 cm|
|PCIe (first plug)||21.8"||18.9"||24.0"|
|PCIe (last plug)||25.6"||23.2"||N/A|
|SATA (last plug)||34.1"||34.6"||41.5"|
|Molex (last plug)||29.1"||29.3"||41.7"|
The V750 and Capstone are roughly comparable—except when it comes to the PCIe leads, which are weirdly short on the Capstone. They're so short, actually, that I'm not sure you could comfortably route them behind the motherboard tray in larger ATX mid-tower cases. We'll chalk up one point for Cooler Master here.
Our old-school reference unit, the Silencer 760W, has the longest PCIe and SATA leads by a longshot. That would be good if the PSU were modular, but it's not. Having extra slack in hard-wired leads typically makes cable management more difficult.