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FSP Epsilon FX700-GLN (700W)

The Epsilon FX700-GLN is a top-end power supply model offered by FSP Group, but I would first like to give you a brief summary of the company’s current model range since I’ve been noticing on many forums that users find themselves confused in the names even though FSP uses convenient and logical letter-digit combinations in its product nomenclature.

What distinguishes FSP from other companies is that low-end models are not a separate branch of the company’s product development, but are renamed previous-generation models. We have already reviewed FSPxxx-60THN units on our site (“xxx” stands for the wattage of a particular model) that belonged to the first generation of ATX12V 2.0 power supplies. Besides the THN series, there exist THN-P, THA and THA-P series that differ from THN in the type of the fan and/or the availability of passive PFC. All these power supplies have an identical circuit design. The BlueStorm AX500-A model may also be viewed as belonging to the THN-P series. It could be marked as “FSP460-60THN-P” because it doesn’t differ in circuit design from the other THN-P series models.

With the arrival of new products the THN and THA series are moving now to the low-end sector where they acquire new names: ATX-xxxPN (previously FSPxxx-60THN), ATX-xxxPNF (previously FSPxxx-60THN-P), ATX-xxxPA (previously FSPxxx-60THA) and ATX-xxxPAF (previously FSPxxx-60THA-P). These “new” models are absolutely the same as the “old” ones – the change of the name only serves to indicate that they are low-end products now. Curiously enough, THA/THA-P series units were but seldom available in retail shops because their small 80mm fan meant increased noise, but they are now widely available under the new name of ATX-xxxPA/PAF.

There was already a remarking of this kind once when, following the release of first ATX12V 2.0 products, the older models of the FSPxxx-60BTV series were renamed as ATX-xxxGTF. And now the ATX-xxxGTF series leaves the production lines to be replaced with ATX-xxxPN/PNF/PA/PAF series units.

Some confusion results from FSP Group’s power supply nomenclature already including models with the PN suffix; marked as FSPxxx-60PN, these units comply with the transitional ATX12V 1.3 standard (they are listed in the table above for reference purposes). You should be aware that, though with similar-sounding suffixes, “ATX”- and “FSP”-marked models belong to different market segments and the suffixes have different meanings. Power supplies of the FSPxxx-60PN and FSPxxx-60PN(PF) series are currently leaving production. There’s no sense in making them anymore now that two generations of ATX12V 2.0 models are already selling.

The two models of the FSPxxx-60GNF series are fan-less units also known as FSP Zen.

The units of the FSPxxx-60PLN/PFN/PLG series stand somewhat apart from the others in the company’s nomenclature. Strictly speaking, they don’t make up any series; these are mostly single models with a single type of the fan and PFC and with a single output power rating. You should be very cautious when comparing these models by their names alone. For example, the FSP400-60PFN and the FSP460-60PFN not only differ in their rated wattage, but in fact belong to two quite different versions of the ATX12V standard. Their circuit design is absolutely different, too.

These units will be replaced by new models in the market, though. The new FSPxxx-60GLC/GLN/HLC/HLN and FSPxxx-80GLC/GLN series (this is where the Epsilon FX700-GLN belongs to) are power supplies with an absolutely new circuit design (as will be shown below) which are going to fully cover the midrange and top-end price sectors in the product assortment of FSP Group.

The units with the number 60 in the name are “home-oriented” ATX12V 2.0 models. Each of them comes in four flavors varying in the PFC design and fan size. Unlike with the older units, a PFC device is always present in the new ones (this is logical enough as the circuit design of a PSU with active PFC doesn’t permit to take this PFC out easily), but may support different ranges of input voltages: either the universal range of 90-265V (in the units with G as the first letter of the suffix) or the range of 176-265V (in the units with H as the first letter of the suffix). The power supplies may come with 80mm (“C” as the last letter in the suffix) or 120mm (denoted with the letter N) fans. I guess that power supplies with small fans won’t be too widespread in retail.

The units with the number “80” in the name are server-oriented EPS12V models, but this division is not too strict. There are no conspicuous differences between the two PSU standards except that EPS12V demands an 8-pin CPU power connector as opposed to the 4-pin connector described in ATX12V. Thus, these units may be considered as higher-wattage versions of the “60” units – at least, there are no fundamental differences in the circuit design. The 80 series units come not in four but in two versions differing in the type of the fan: FSPxxx-80GLC and FSPxxx-80GLN. The active PFC device supports the full range of input voltages in both the versions.

To summarize what I’ve written above: 1) the ATX-xxxGTF and FSPxxx-60PN(PF) series units complying with the older versions of the PSU standard are not produced anymore; 2) the FSPxxx-60THN/THA series models of the up-to-date ATX12V 2.0 standard are moved into the low-end sector and are renamed as ATX-xxxPN/PNF/PA/PAF (their circuit design remains unchanged); 3) the new models FSPxxx-60GLC/GLN/HLC/HLN and FSPxxx-80GLC/GLN fill in the mainstream and high-end sectors of the market.

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