I don't have a t620 Plus. Scott (scottie4442) does and has kindly provided the photos and the additional information on this page.
Obviously the motherboard is the same as the ordinary t620, however it does come fitted with a more powerful Quad core CPU than the Quad core option of the standard t620. In this tab I just highlight the differences from the t620.
There is a factory-fit option of an additional graphics card - an AMD FirePro 2270 Multi-View Professional Graphics dual-head graphics card - but in this case Scott has chosen to install a four-port gigabit PCIe NIC in the expansion slot.
Other than the added serial port and parallel port the t620 Plus is fitted with a more powerful AMD Quad-Core GX-420CA 64-bit SOC (2.0 GHz, 2 MB L2 Cache) with AMD Radeon HD 8400E (600MHz GPU) Graphics.
There is also the Riser Card/Expansion Slot which the specification sheet describes as "PCIe 2nd Gen, x16 slot with x4 channels". By this they mean that the connector is physically x16 size, but electrically it only supports x4.
Obviously the power consumption will be higher with the different processor - the TDP of the GX-420A is 25W compared with 15W for either of the CPUs fitted in the standard t620. You also have to add in the power consumption what ever you choose to fit in the PCIe slot. HP recognise this by supplying the t620 Plus with an 85W PSU rather than the 65W PSU that comes with the standard version.
As noted above the t620 plus comes with an 85W PSU. If you don't have a PSU and are thinking of using something other than the standard PSU see this page.
In July 2021 I heard from (another) David. He had a few t620 pluses with HP PSUs that were failing to run. On power-up, during the POST phase, they bombed out with an error. The Red LED flashed a repeating error sequence of four flashes. This was accompanied by four beeps for the first few cycles. The four beep error code means "The incorrect external power supply adapter is being used on the unit."
As I've noted elsewhere the BIOS checks for an HP PSU on power up and complains if it doesn't recognise the PSU in use. It turns out the t620 plus goes one step further and will complain and halt if the PSU in use has a power rating <70W. i.e. You'll need to be using the 85W one rather than the more prevalent 65W PSUs.
In David's investigation of this problem he discovered that his problem went away if he unplugged the riser in the t620 plus. So it looks like the BIOS uses the presence/absence of the extra ports on this board to decide whether it is a t620 or a t620 plus. In the latter case it imposes the higher PSU power requirement.
From the linux cpuinfo data for the Quad Core processor:
| vendor_id | : | AuthenticAMD |
| cpu family | : | 22 |
| model | : | 0 |
| model name | : | AMD GX-420CA SOC with Radeon(tm) HD Graphics |
| stepping | : | 1 |
| flags | : | fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc extd_apicid aperfmperf eagerfpu pni pclmulqdq monitor ssse3 cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt topoext perfctr_nb bpext perfctr_l2 hw_pstate proc_feedback vmmcall bmi1 xsaveopt arat npt lbrv svm_lock nrip_save tsc_scale flushbyasid decodeassists pausefilter pfthreshold |
| address sizes | : | 40 bits physical, 48 bits virtual |
00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 16h Processor Root Complex
00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Kabini [Radeon HD 8400E]
00:01.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Kabini HDMI/DP Audio
00:02.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 16h Processor Function 0
00:02.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 16h Processor Functions 5:1
00:02.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 16h Processor Functions 5:1
00:02.3 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 16h Processor Functions 5:1
00:10.0 USB controller: Advanced Micro Devices, Inc. [AMD] FCH USB XHCI Controller (rev 01)
00:11.0 SATA controller: Advanced Micro Devices, Inc. [AMD] FCH SATA Controller [AHCI mode] (rev 40)
00:12.0 USB controller: Advanced Micro Devices, Inc. [AMD] FCH USB OHCI Controller (rev 39)
00:12.2 USB controller: Advanced Micro Devices, Inc. [AMD] FCH USB EHCI Controller (rev 39)
00:13.0 USB controller: Advanced Micro Devices, Inc. [AMD] FCH USB OHCI Controller (rev 39)
00:13.2 USB controller: Advanced Micro Devices, Inc. [AMD] FCH USB EHCI Controller (rev 39)
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 3a)
00:14.2 Audio device: Advanced Micro Devices, Inc. [AMD] FCH Azalia Controller (rev 02)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 11)
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 16h Processor Function 0
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 16h Processor Function 1
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 16h Processor Function 2
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 16h Processor Function 3
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 16h Processor Function 4
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 16h Processor Function 5
01:00.0 PCI bridge: Integrated Device Technology, Inc. [IDT] PES12N3A PCI Express Switch (rev 0e)
02:02.0 PCI bridge: Integrated Device Technology, Inc. [IDT] PES12N3A PCI Express Switch (rev 0e)
02:04.0 PCI bridge: Integrated Device Technology, Inc. [IDT] PES12N3A PCI Express Switch (rev 0e)
03:00.0 Ethernet controller: Intel Corporation 82571EB Gigabit Ethernet Controller (Copper) (rev 06)
03:00.1 Ethernet controller: Intel Corporation 82571EB Gigabit Ethernet Controller (Copper) (rev 06)
04:00.0 Ethernet controller: Intel Corporation 82571EB Gigabit Ethernet Controller (Copper) (rev 06)
04:00.1 Ethernet controller: Intel Corporation 82571EB Gigabit Ethernet Controller (Copper) (rev 06)
05:00.0 Network controller: Broadcom Corporation BCM4352 802.11ac Wireless Network Adapter (rev 03)
06:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express
Gigabit Ethernet Controller (rev 0c)
Note: The Intel 82571EB ethernet controller is on the added expansion card.
The fan plugs into a connector adjacent to one of the internal USB ports (the one by the CMOS push button). I guess you can unplug it if you don't need it, but Scott does report it as being "..super quiet and barely noticeable..."
