1. TechSpot Forums are dedicated to computer enthusiasts and power users. Ask a question and give support. Join the community here.
    TechSpot Forums are dedicated to computer enthusiasts and power users.
    Ask a question and give support.
    Join the community here, it only takes a minute.
    Dismiss Notice

OCZ shows external USB 3.0 SSD, new PSUs

By Matthew
Jan 8, 2010
  1. Along with OCZ's upcoming Vertex 2, SAS and PCIe SSDs, the company has also unveiled a 2.5-inch USB 3.0 external SSD, a couple of power supplies. The portable SuperSpeed USB SSD features MLC flash memory in capacities of 64GB, 128GB and 256GB, is encased in aluminum, measures 56 x 120 x 10 millimeters, and weighs 87.7 grams.

    Read the whole story
  2. raybay

    raybay TS Evangelist Posts: 7,241   +9

    How do they define 85% power efficiency and 88% power efficiency... against what standard ? What is special about 135 mm double ball-bearing fans, which can actually be more trouble than they are worth.
  3. dividebyzero

    dividebyzero trainee n00b Posts: 4,891   +1,258

    Power efficiency like the 80+ rating you see applied to many psu's is calculated at different power draws - 20%, 50% and 100%
    So,for example if the PSU is rated at 85% efficiency then for a 750 watt power supply it can deliver 85% of the 750 watts ( 0.85 x 750 = 637.5 watts), the remaining 15% is converted into heat ( 112.5 watts)
  4. dividebyzero

    dividebyzero trainee n00b Posts: 4,891   +1,258

    The power draw is calculated at 20%, 50% and 100% of its rated power load and the lowest value is generally accepted as the power efficiency -although some manufacturers fudge the numbers by quoting only one of the three values- Hence the adoption of the 80+ certification:
    80% power efficiency at 20, 50 and 100% = 80+ certification, so you need at least:
    81/82% at 20% draw, 85% at 50% draw and 81/82% at 100% draw = 80+ Bronze cert.
    85% at 20% draw, 88/89% at 50% draw and 85% at 100% draw = 80+ Silver cert.
    87/88% at 20% draw, 90/92% at 50% draw and 87/88% at 100% draw = 80+ Gold cert.
    90% at 20% draw, 94% at 50% draw and 91% at 100% draw = 80+ Platinum cert.

    Fan size and capability is either an advertising ploy or because the power supply needs that much cooling (i.e. generates a lot of heat) and yes bb fans are usually noisy. Taking the PSU apart and replacing the fan with a fluid or electromagnetic drive will usually cure the problem)
    I wouldn't recommend taking apart a PSU that has already been in use as the capacitors store a charge long after the power supply has laid dormant.

    Sorry about the double post- hit the wrong button before- loooong day.
  5. Regenweald

    Regenweald TS Rookie Posts: 143

    You just clarified a lot about psu tech for me. Thanks man :)
Topic Status:
Not open for further replies.

Similar Topics

Add New Comment

You need to be a member to leave a comment. Join thousands of tech enthusiasts and participate.
TechSpot Account You may also...