Now let’s move on to disassembling the card and the exciting details inside. Disassembly is relatively easy if you carefully remove the individual connectors. All screws are located on the back of the backplate or from above on the board. So you have to take everything apart to get to the PCB. There is no clamping cross, so the four spring screws have to suffice.
PCB layout and components
In principle, the PCB is very similar to AMD’s reference card. Here, too, we find VDDCR_GFX, which also relies on 12 real phases, each of which controls a single voltage regulator. VDD_SoC remains with three phases and one voltage regulator per phase. In addition, VDDCR_USR has two phases and therefore two further voltage regulators. This is supplemented with two phases or two voltage regulators for VDD_MEM and a single buck converter for VDDCI_MEM.
Although the generation of VDDCI_MEM is not a large item in terms of performance, it is nevertheless extremely important. It is used for the GPU-internal level transition between the GPU and the memory signal, something like the voltage between the memory and the GPU core on the I/O bus. In addition, a constant source for 0.75 volts is generated. The majority of these very similar voltage converters are located on the front of the board. There is also a 1.8V source (TTL, GPU GPIO), VDD_13 (Aux) and an ultra-low dropout chip generates the very low voltage for the PLL area (VPP).
Two PWM controllers for generating the most important phases (red and blue) are located on the back (bottom image) in the top left third of the board, with another on the top right (green). This time, AMD relies on the top products from Monolith, as did NVIDIA for the reference cards. The first rail of the MP2857 (blue) is used for the 12 phases of the VDDCR_GFX, while the second rail is used to generate the VDD_MEM. It is a digital, multiphase dual-rail controller that primarily provides the power supply for the PWM VID core and is also compatible with the AVS bus interface.
The MP2857 can (and should) also work with Monolith’s Intelli-Phase products to complete the multiphase voltage regulator (VR) solution with a minimum of external components. The two somewhat smaller MP2856 (red) and MP2240 (green), which unfortunately are also not publicly available in terms of data, are then responsible for VDDCI, VDD_SoC and VDDCR_USR, depending on the side.
All power stages used, including those for the memory, are also products from Monolith. The MP87997 is also still quite new and not freely documented, but it should be a very powerful monolithic half-bridge. The integration of drivers and MOSFETs (DrMOS) results in high efficiency due to an optimized dead time and a reduction of parasitic inductance. This small, 5 mm x 6 mm LGA component fits perfectly with the PWM controllers used by Monolith. An MCU for all the control tasks is integrated this time (front side) and of course we have the 12 RAM modules from SK hynix with the 20 Gbps.
- 1 - Einführung, technische Daten und Technologie
- 2 - Test Setup
- 3 - Teardown: PCB, Topologie und Komponenten
- 4 - Teardown: Lüftersystem und Kühler
- 5 - Teardown: Material-Analyse
- 6 - Gaming Performance WQHD (2560 x 1440)
- 7 - Gaming Performance Ultra-HD (3840 x 2160)
- 8 - Gaming Performance FSR vs. DLSS
- 9 - Details: Leistungsaufnahme und Lastverteilung
- 10 - Lastspitzen, Kappung und Netzteilempfehlung
- 11 - Temperaturen, Taktraten und Infrarot-Analyse
- 12 - Lüfterkurven und Lautstärke
- 13 - Zusammenfassung und Fazit
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