Zalman ZM750-HP is an excellent 750 W power supply. It can deliver up to 850 W at 50º C, has high efficiency (up to 90%) even when delivering its labeled power (85% at 750 W), electrical noise level inside specs and outstanding voltage stability, probably due to its thicker wires (16 AWG instead of 18 AWG). And what is great, it comes with a very attractive price tag for a 750 W product that can deliver what is promises and plus some more (Zalman says this unit can deliver up to 86% efficiency, but this is an understatement).

Even though it has far more peripheral cables you will ever need (nine SATA power plugs and nine standard peripheral power plugs) it comes with only two power cables for video cards. This is the only flaw from this product. It can easily power two very high-end video cards like GeForce GTX 260, GTX 280, Radeon HD 4870, etc but you won’t be able to install two of these card in SLI or CrossFire mode directly. Since these video cards require two auxiliary power connectors each, you will need to use adaptors to convert some of the standard peripheral power plugs into video card auxiliary power plugs.

Corsair TX750W, for example, is cheaper and does not have this problem (it comes with four video card cables), but provides lower efficiency and higher noise levels.

This is the reason we are giving this product our “Silver Award” instead of Golden, as we think a product on this power range must have four auxiliary power connectors for video cards.

Internally ZM750-HP uses the same project as Zalman ZM600-HP, OCZ StealthXStream 600 W and OCZ GameXStream 700. While the secondary from ZM750-HP is identical to the secondary from ZM600-HP and GameXStream 700 W (StealthXStream 600 W uses rectifiers with lower current limits), the primary is different, using components with higher current limits, especially the rectifying bridges (16 A vs. 12 A).