Silverstone Strider 750w ST75F PSU Page: 1
Introduction

Just over a month a go I was given the opportunity to review Silverstone's 600w Strider unit. Overall I was reasonably impressed, and the unit just about managed to nab our "Recommended" award.

Today I'll be taking a look at Silverstone's latest addition to their modular PSU family - the ST75F. Boasting 150w more power than the original ST60F and an extra 5% efficiency will this unit also improve on the mediocre rail stability of its predecessor?


Packaging

Having reviewed quite a few Silverstone products on Overclock3D I was fairly confident of what to expect from the ST75F. The unit comes in a double walled black cardboard box with a design that ties in with the rest of the Silverstone range.

This standardised design makes it easy to pick out Silverstone products among the other brands, and the unit's specifications are clearly visible on all sides of the box.

Silverstone Strider ST70F Box Silverstone Strider ST70F Box

In all honesty, nothing much has really changed between the packaging design of the ST60F and ST75F. The front and top of the box still show pictures of the power supply along with its vital statistics. Like it's predecessor, the ST75F also has full support for ATX12v and EPS12v standards, Quad +12v rails and a quiet running 120mm fan.

Silverstone Strider ST70F Box

Turn the box around to the side and we can see that Silverstone have included some more detailed information on the unit. A lot of focus is on its safety features, which include OCP (over current protection), UVP (under voltage protection), OVP (over voltage protection) and SCP (short circuit protection).

Silverstone Strider ST70F Package Silverstone Strider ST70F Packaging

As with the previously reviewed ST60F, the ST75F is protected from scratches by a clear plastic bag with no other padding to protect the unit from larger knocks included. It would be nice to see Silverstone paying a bit more attention to packaging, as there is nothing worse than receiving damaged goods.

The ST75F package includes the following items:

1x Silverstone ST75F manual.
4x Black case screws.
1x Power cord.
1x ST75F Power Supply.



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Specifications

The following information has been taken directly from Silverstone's Website:

"With improved technology and manufacturing, SilverStone extended the capability of the award-winning Strider ST60F modular power supply further up to 750W continuous power output (sustainable at 50˚C operating temperature) and 80% efficiency. Updated to ATX 12V 2.2, this 120mm fan modular power supply is an excellent choice for high-end desktop systems with dual or quad graphics cards. Housed in an environmentally friendly casing of manageable size and offering a high variety of cable selections, the Strider Strider ST75F will again set the benchmark for modular power supplies in its class."

• Enhanced Quad +12V rail for superior performance
• 100% modular cables for maximum flexibility
• Powerful & quiet running ball bearing 120mm fan
• Industrial class components with 80% efficiency
• Support for ATX 12V 2.2 & EPS 12V

ST75F Specification

The +12v rails on the ST75F have been given a healthy power boost up to 18 amps each (54a total), which is a great improvement over the ST60F's arrangement of 13a,18a,16a,8a. The efficiency has also been greatly improved from 75% (on the ST60F) to over 80%.



Silverstone Strider 750w ST75F PSU Page: 3
Appearance

When Silverstone set out to improve upon the ST60F series their sights were firmly set on performance rather than looks. As a result, the ST75F and ST60F units are almost identical with only minor revisions being made to the ST75F's casing.

Silverstone Strider ST75F Back Silverstone Strider ST75F Bottom

The ST75F is finished in a matt black lead-free paint and has a minimal amount of shine. As you can see from above, the sample unit I received had several scratches in its paintwork. Could this be a result of the sub-par packaging?

The layout of the ST75F is exactly the same as the ST60F and as a result sports the same 120mm fan placed slightly off centre at the bottom of the unit.

The back of the unit is vented with a honeycomb mesh and you may also notice that there is no 110/240v switch present. This is because the ST75F, like many other modern PSU's is able to auto-detect the input voltage.

Silverstone Strider ST75F Top

On the top of the ST75F we can see one unique feature that enables you to easily distinguish it from the ST60F - an embossed Silverstone logo. This adds a nice personalised touch to the unit, but unfortunately most of us will not see this side of the unit once it is placed inside an ATX case.

Silverstone Strider ST75F Side Silverstone Strider ST75F Side

Turn the unit around to the side and we can see that Silverstone have provided adjustable potentiometers (pots) positioned behind two small holes in the casing. Pot's can be used to adjust the voltage output of the rails on the power supply, and can come in handy when voltages droop outside of ATX specifications.

Silverstone Strider ST75F Front Silverstone Strider ST75F Connectors

The front of the ST75F comes with a total of 11 modular connectors, which is significantly more than some of the other modular power supplies we've reviewed on OC3D in the past. You will also notice that the ST75F is fully modular, and therefore all cables including the ATX and EPS connectors can be removed if required.



Silverstone Strider 750w ST75F PSU Page: 4
Connectors

With 750w available you certainly don't want to be shortchanged when it comes to the number of devices that you can hook up. Most power supplies nowadays offer 6x Molex and 4x SATA as a minimum, but will the Strider have anything more to offer?

Silverstone Strider ST75F Cables Silverstone Strider ST75F Cables

The ST75F uses exactly the same type of cables as the ST60F. As a result, all cables on the ST75F are professionally sleeved in black mesh right up to the first connector. The sleeving is then held in place with sticky tape and finished off with black shrink-wrap.

It is also worth mentioning that Silverstone sell a shorter modular cable kit for SFF (small form factor) systems. More information on the PP03 kit can be found here.

Silverstone Strider ST75F Quad-SLI

With 750w on tap and evenly distributed rails, there is no reason why the ST75F wouldn't be capable of Quad-SLI. For this reason Silverstone have included 2x PCI-E cables, each with 2 PCI-E connectors attached to give the unit a total of 4x PCI-E connectors for Quad-SLI compatibility. This does make the ST75F slightly less modular, as users of only one graphics card will need to tuck away the extra cable.

Silverstone Strider ST75F ATX Silverstone Strider ST75F EPS12V

The ST75F comes with a 24-Pin ATX connector and no way of reducing the connector down to 20-Pin. People wanting to use this unit on an older style 20-pin ATX motherboard will need to purchase a 24-Pin to 20-Pin connector separately.

Quite a few of the most recently released motherboards still utilise the 4-Pin (P412v) connector, and for this reason Silverstone have included both P412v and EPS12v (8-pin) cables to ensure full compatibility.

ATX P412v PCI-E

SATA Molex Floppy



Silverstone Strider 750w ST75F PSU Page: 5
Looking Inside

As with all power supplies that pass through Overclock3D, I'll be taking a look inside the Strider. By doing this I should be able to get a good idea of the overall build quality of the unit and how it is likely to perform in our tests.

It will also be interesting to see exactly what has changed between the ST60F and ST75F models.

Silverstone Strider ST75F Inside Silverstone Strider ST75F Inside

Open up the ST75F and at a quick glance you'd be forgiven for thinking that the insides are an exact mirror of the ST60F's. From the images above we can see that Silverstone have used the same over-sized aluminium heatsinks as in the ST60F, but several changes have been made to the essential components. Most notable has to be the increase in size of the wire-wound coils and the gauge of the copper wire. Another visible change is the replacement of the large yellow capacitor with a higher quality black one.

All of these changes will hopefully improve the performance of the unit, but we'll find out for sure in the testing over the next page.

Silverstone Strider ST75F Pots

Above we can see the circuit board containing the adjustable potentiometers mentioned earlier in the review. These pots are capable of adjusting the voltage on the ST75F's rails by around +/- 0.6v - but hopefully they won't be needed!

Silverstone Strider ST75F Fan

The 120mm fan cooling the ST75F is manufactured by ADDA (Model: AD1212HS-A71GL). At 12v the fan spins at 2200rpm and pushes 85.2cfm with a noise level of 39.1dBA. This is the very same fan used inside the ST60F, so noise output results should be very similar.



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Load Testing

In order for the results from all current and future PSU reviews to remain fair and comparable, Overclock3D uses a custom built Power Supply load stress tester.

The tester will be placing the following loads on each of the ST75F's rails:

+3.3v - 20a Load
+5.0v - 20a Load
+12v1 - 10a Load
+12v2 - 10a Load
+12v3 - 10a Load
+12v4 - 10a Load

The results are collected from a Mastech MAS-345 Multimeter which logs its readings via RS232 to a PC.

Silverstone Strider ST75F +3.3v Silverstone Strider ST75F +5.0v

The ST75F showed excellent results on both the +3.3v and 5v rails keeping fluctuation to under 0.02v. This is a massive improvement over the ST60F, which suffered a significant voltage droop of 0.29v on its +5v rail.

Silverstone Strider ST75F +12v1 Silverstone Strider ST75F +12v2

Silverstone Strider ST75F +12v3 Silverstone Strider ST75F +12v4

Continuing the trend, the ST75F shows excellent voltage regulation on the +12v rails, this time managing to keep fluctuation at or below 0.06v.


Efficiency Testing

Efficiency tests are performed by measuring the wattage consumed by the power supply at the mains against the power (in watts) consumed by the OC3D power supply stress tester. These results may not be 100% accurate, but have proven to be extremely close to results obtained from professional equipment.

Silverstone Strider ST75F Efficiency

The Strider ST75F was placed under a load of 646 watts. This counts for a total of 86% of the power supplies rated output. At this load, the power supply required 798 watts from the mains to produce the 646 watts required by our custom made power supply tester. Therefore the efficiency of this power supply can be found by a simple equation: (646 / 798) * 100, which works out to be an efficiency rating of 80.9%.


Noise Testing

Possibly the hardest part of any PSU review is summarising the level of noise given out by the unit. The threshold for what is considered 'noisy' varies from person to person and therefore what I may consider a quiet unit, another person may consider extremely loud. A common way to resolve this issue is to use a dBA meter to measure the units noise level, however this doesn't take into account the pitch (type) of noise emitted and whether it is likely to irritate end users.

For this reason OC3D records all power supplies at idle and load in wav format for you to make your own informed decisions. All recordings are taken at 30cm away from the PSU and outside of a PC case. You will need to remember that noise levels will be reduced by varying amounts once the PSU has been installed inside your PC enclosure.

Idle Recording - Download
Load Recording - Download

As previously mentioned, the ST75F utilises exactly the same fan as the ST60F and as a result my opinion of the noise levels has not changed. The results from the ST60F review can be found here.



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Conclusion

Silverstone have taken the original ST60F modular PSU and improved it in the area needed most - performance. The ST75F not only has a total of 150w more power than it's predecessor, but also has extremely stable voltages across all rails and full support for Quad-SLI.

Efficiency has also been improved on the ST75F by around 5%, bring it up to just over 80%. This is much better than the efficiency of the ST60F, and will hopefully save you a bit of money on your energy bills!

The only issue that prevented me from giving this unit our "Editors Choice" award was the poor packaging. A couple of styrofoam inserts is all it would have taken to ensure no damage came to our sample unit. I hope that Silverstone will revise their packaging in the near future, as there is nothing worse than receiving damaged goods.

At present the ST75F is in limited supply here in the UK. Thankfully our friends over at Specialtech have managed to get their hands on some and are selling them for £95 - a very good price for a fully modular 750w power supply with the ST75F's qualities.


Pro's
• Solid voltages under high loads.
• Greatly improved efficiency over ST60F.
• Fully modular cabling.
• Quad PCI-E connectors.
• Professional cable sleeving.
• Adjustable voltages.

Con's
• Poor packaging may cause cosmetic damage to unit.


Recommended Value For Money


Manufacturer Response

In order for all reviews to remain fair and accurate, Overclock3D allows every manufacturer 24 hours to respond to any comments or issues brought up during the review. Silverstone have taken this opportunity to highlight the following points:

1. The fan controller for the ST75F is tuned to be quieter than ST60F because the efficiency is higher so not as hot as ST60F. The ST75F is about 2-4 dBA more silent.
2. The retail packaging on the ST75F is the same design as that used on the ST60F. We have received very few complaints regarding damage during shipping due to insufficient packaging.
3. The ST75F has stickers on its cables labelled with 12V1, 12V2, 12V3, 12V4. This is very useful to load the four 12V rails from the PSU like you need, and you can take in mind, to choose the rails to not overload one.



Thanks to Silverstone for providing this unit for review.

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