HP t620 Flexible Thin Client

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    The HP t620 seems to be following the trend where the more modern thin clients are on the larger size. The t620 was launched in December 2013 and comes in two form factors - the t620 (which is what is described here) and the t620 PLUS which is a fatter version that will accommodate an expansion card. The first two bullet points from the press release read:

    Powerful processing with AMD processors. The combination of an AMD GX dual- or quad-core processor and AMD Radeon HD professional graphics gives the HP t620 strong multimedia performance and makes it up to 50 percent faster than the HP t610. The HP t620's completely redesigned chassis includes advanced passive cooling for fan-less support of quad-core processors, helping businesses reduce the number of service calls and the need for product refreshes.

    Flexibility to drive up to four displays. The HP t620 is the company's first thin client capable of powering two 30-inch diagonal 2,560 x 1,600 displays with the standard chassis. With a factory-installed add-in video card, the HP t620 PLUS can support up to four displays, allowing users to increase productivity by viewing information on multiple monitors.
    My t620 doesn't carry a manufacturing date but the antenna parts carry a label dated 2014/07/30 and the BIOS is dated 10/09/2014.

    The t620 was launched by HP in December 2013.

    Specifications
    Processor: AMD G-Series GX-415GA SOC: quad-core APU 1.5GHz Radeon HD 8330E graphics
    Flash RAM: 4GB
    Network: 10/100/1000
    USB: 4 x USB2.0 (2 front, 2 rear)
    2 x USB2.0 (internal)
    2 x USB3.0 (front)
    Serial: 1
    PS/2: 2 (Kybd and Mouse)
    Video: 2 x Display Port
    Power: 19.5V 3.33A (label)
    Plug: Coax male 7.4mm/5.0mm + centre pin
    Off 1W
    Idle ~8W
    Running ~11W

    The embedded operating system is one of:

    HP ThinPro (32-bit)
    HP Smart Zero Core (32-bit)
    Windows Embedded Standard 7E (32-bit)
    Windows Embedded Standard 7P (64-bit)
    Windows Embedded 8 Standard (64-bit)
    Windows 10 IoT Enterprise (64-bit)
    My example is fitted with Windows Embedded Standard 7E.

    Power SupplyPSU label
    The t620 is supplied with a 65W 19.5V 3.33A DC supply. The connector is proprietary(?) male coaxial connector. According to my micrometer the external diameter of the barrel is 7.4mm, the internal diameter 5mm. I don't what the size is of the recessed centre pin. (See photo right for the connector).

    CPU
    The CPUs fitted to the t620 are from the first generation of AMD's Embedded G-Series System-on-Chip (SOC). The one fitted to my t620 is a dual core AMD GX-217GA with Radeon(tm) HD Graphics. Other CPU options are the quad-core GX-415GA or GX-420CA.

    Expansion
    HP t620 circuit boardThe circuit board is shown right. I have removed the metal screening box that normally covers the RAM. Click on the image for a larger version.

    Flash: Early production systems were built with both a mSATA socket and a M.2 socket to facilitate a transition from one form factor to the other during the product's production life. The mSATA socket was subsequently removed from production at the end of 2014; since that time all systems are built with a single M.2 socket. My example has a single M.2 socket carrying the 16GB flash module. The module is a Sandisk U110 M.2 2242 which the datasheet tells me is 22.00mm x 42.00mm x 3.5mm in size.

    Looking at the photograph of the motherboard (see also below) there are two further mounting holes so you should also be able to fit either a 2260 or a 2280 M.2 module.

    RAM: There are two on-board sockets to take DDR3L SODIMMs. The datasheet gives the data transfer rate as 1,600 MT/s. In my case there is a single 4GB SODIMM fitted. The Samsung part is marked 4G 1Rx8 PC3L-12800s-11-13-B4 and the part number is M471B5173QH0-YK0

    USB: There are a plethora of USB connections in the t620. There are four sockets on the front panel. Two of these are USB2.0 and two are to the USB 3.0 standard. The rear panel carries two USB 2.0 sockets. Finally there are two more USB 2.0 sockets fitted internally. Unlike earlier HP thin clients like the t5730 where there was a separate internal 'secure' compartment for whatever was plugged into these ports, with the t620 the sockets are directly mounted on the motherboard. In the photo you can see them top left (Flash drive maximum dimensions: 65mm (L) x 25mm (W) x 10mm (H)) and bottom middle (Flash drive maximum dimensions: 55mm (L) x 16mm (W) x 8mm (H)).

    Mini PCI-E: The t620 has a Mini-PCIe slot for a wireless network card. This may be fitted with one of: Broadcom 802.11n, Broadcom 801.11ac or Intel 802.11ac. From the PCI listing above you can see mine is a Broadcom BCM43228.


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