This is one of those slightly confusing situations from the Dell/Wyse transition. The unit I purchased was sold as Dell WYSE 7020 Thin Client ZX0Q No RAM, Power Supply Or Stand. It is clearly marked on the label as a Zx0Q, however I can't find it in the various Z-Class datasheets I have tracked down. These just mention the Z90Q7 based on the Quad core AMD GX-420CA SOC 2.0GHz with integrated Radeon HD 8000 graphics. However a Dell 7020 datasheet offers the Quad-core AMD GX-420CA 2.0 GHz and the Quad-core AMD GX-415GA 1.5 GHz (Quad Display configuration). What I have is the latter model with the Quad Display configuration.
The Dell Wyse Z-class brochure that mentions the Z90Q7 is dated May 2013. The Dell 7020 datasheet is dated April 2017.
My Zx0Q has part No: 08WF82 and was manufactured in February 2018.
Note: I've only seen this single version of the Zx0Q/7020. Whether there are significant mechanical/electrical differences between the various units that come under this name I have no real idea. However, in researching things, I came across a photo of a unit with a SSD fitted (see the Mods tab). This photo shows a more extensive heatsink in place which I guess reflects the 25W TDP of the GX-420CA. With my quad display Zx0Q some of this heatsink has been removed to create space for the add-on dual video board, so I assume a knock-on effect of this was the switch to the GX-415GA cpu which has a lower TDP of 15W.
In February 2024 I heard from Kris who provided me with photos and details on the standard (GX-420CA) version. You can see the differences in the motherboard photos.
The basic specs for the 7020 are:
Processor Standard
Quad DisplayQuad-core AMD GX-420CA 2.0 GHz
Quad-core AMD GX-415GA 1.5 GHzMemory Flash
RAM8GB/16GB/32GB
2GB/4GB (max 16GB)Video Standard
Quad Display
Max resolution
Dual display
Quad displayAMD Radeon HD 8400E graphics (integrated with APU)
AMD Radeon HD 8330E and AMD Radeon E6240
2560 x 1600 32-bit colour (Display Port)
1920 x 1200 32 bit colour (DVI-I port)
1920x1200
up to 3840x2160 (DisplayPort daisy-chain):Ports Video
Network
USB
Serial
Parallel
PS/21 x DVI-I, 1 x Display Port
2 x Display Port (Quad Display Configuration)
10/100/1000
4 x USB2.0
2 x USB3.0
0
0
0Power Power
Plug
Off
Idle
Running19v
Coax 5.5mm/2.5mm
0W
13W
17WDimensions H x W x D (mm) 200 x 47 x 225 (without foot)
The flash in my Zx0Q had been wiped. The 7020 datasheet gives the possible OS as:
The Zx0Q runs from a 19V PSU. The connector is a standard 5.5mm/2.5mm coax plug.
In January 2022 I heard from Martin who notes that a 9mm (length) plug is too short and, whilst it does work, it can be easily dislodged. He will be replacing it by a 14mm one.
For those to whom it matters here is some detail from Linux's /proc/cpuinfo for the quad core GX-415GA.
vendor_id : AuthenticAMD cpu family : 22 model : 0 model name : AMD GX-415GA 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 cpuid extd_apicid aperfmperf 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_llc hw_pstate proc_feedback ssbd vmmcall bmi1 xsaveopt arat npt lbrv svm_lock nrip_save tsc_scale flushbyasid decodeassists pausefilter pfthreshold overflow_recov
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 8330E]
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
00:02.3 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 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Seymour [Radeon E6460]
01:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Caicos HDMI Audio [Radeon HD 6450 / 7450/8450/8490 OEM / R5 230/235/235X OEM]
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06)
I have highlighted in red the two lines contributed by the additional video board.
Click on the photo for a larger version.
Both the Flash memory and the RAM in the Zx0Q are easily(?) replaceable. (Not so easily in this version with the added video board).
Flash: The flash is a small horizontal SATA DOM on the motherboard. In this version it is under the video board (top right in the photo) that you need to remove to gain access. (See the Disassembly tab). Although the RAM had been removed from my Zx0Q the 32GB SATA DOM was still present.
There is also another SATA data socket on the board. (See the Mods tab for an example of this in use)
RAM: The board carries two SODIMM sockets for DDR3 RAM. My Zx0Q came without any RAM fitted. The SODIMM sockets are located underneath the metal carrier (center left in the photo) that is designed to carry a standard 2.5" SSD.
I tried out an 8GB part (Hynix PC3L-12800S) and a 4GB part (Elpida PC3-12800S) both of which worked. If only a single SODIMM is fitted it has to be in the upper SODIMM slot.
SATA: With the video board out of the way you can see the SATA module (top leftish) and
SATA data socket (rightish, just above a white socket).
Top right you can see a white socket with a black plug and cable fitted. The plug on the other end of the cable is the white plug just to the top left of the SATA DOM. This is the power cable to the added video board. Under the Mods tab you can see the socket next to it being used as the power connector for an added SSD.
mPCIe: A fact I missed in in my original write-up. There is a mPCIe socket that
is concealed under the heatsink metalwork. It is also fitted in the standard Zx0Q which
has the larger CPU heatsink. This means that you will have to temporarily remove the heatsink
if you wish to plug anything into the socket.
Connectors: There are a number of connectors on the board under the video board.
The video board is connected to CN6 which provides +12V. This socket has 2mm pin spacing. (See below)
Adjacent to it is CN1700 which, in the photo in the Mods tab is being used to power the SSD. I plugged a 1.2mm spacing JST plug into this socket. The two pins closest to the edge measured GND, the other two +5V.
Plugs: On the left is the lead that supplies +12V to the video card, on the right
is a 2mm pin-spacing JST connector.
AS you can see the raised tabs on the two connectors are not in the same place, but judicious use of a sharp knife to remove the raised tabs would let you use the JST connector if you need +12V for something.
Caddy: The SSD caddy fitted to the Zx0Q. I assume this is a standard fit as it isn't something
that's required by the 'quad display' build. Mind you, having typed that, I remembered that the
two tabs you can see at the top of the photo do act as supports for the board providing the
additional two video ports.
Video The additional video board. The two display port connectors are to the left. Bottom right are
the power connector and the ZIF socket for the ribbon cable that connects to the motherboard.
In April 2022 I heard from Judson on the topic of using the CN1700 connector.
Finding the JST 1.2mm connectors with suitable pigtails was proving difficult. In my searching for similar connectors the one that caught my eye was the Molex Pico Blade 1.2mm 4 pin. After further research I've come to the conclusion that the board side connector is a older revision of the Pico Blade with a closed design compared to the newer connectors that have the backside holes open.
I note these are actually 1.25mm spacing and the connector style is a 'blade' rather than a square post. But if it works does that matter?