In the height of summer, smaller PC cases heat up considerably. With well over 212☏ (100☌), and up to 234☏ (112☌) during the stress test, this could lead to problems over time.Īfter all, these measurements were taken in an air-conditioned room at 72☏ (22☌). Their through-hole leads work like little antennas, effectively transporting heat inside. Again, this is within an acceptable range, since only temperatures as high as 302☏ (150☌) would end in an OTP-related shut-down. The PWM controller mounted on the back of the board (visible just right of the VRM label as a faint rectangle) measures approximately 221☏ (105☌). However, the excess heat travels through the multi-layer circuit board's copper traces and spreads over a large area. Although that sounds bad, it's not out of spec for the built-in MOSFETs, which are rated at up to 302☏ (150☌). Our stress test gets them up to 246☏ (119☌). Even on an open test bench, temperatures during our gaming loop reach 234☏ (112☌). Since the PCB was designed to facilitate doubling, one of the two MOSFETS could have been moved into the second regulator circuit's vacant space.Īs our infrared readings demonstrate, though, a lack of active cooling on the VRMs has negative consequences. This is made worse by the fact that two of these MOSFETS are positioned fairly close to each other. But concentrating all of the components in one package also comes with a significant disadvantage: the creation of thermal hot-spots. The three GPU phases are controlled using one uPI Semiconductor uP9505P, with each regulator circuit realized as a highly integrated E6930 Dual N-Channel MOSFET, which combines the gate driver, high- and low-side MOSFET, and Schottky-diode in one convenient package.Īgain, this is meant to cut costs and conserve space. However, this minimalist configuration with just one regulator circuit per phase, similar to Nvidia's reference design, seems to be more popular given its lower cost. Fundamentally, that bar doesn't have any practical significance, since the duration of those peaks is too brief for them to matter.In theory, the PCB could have enabled three phases and a maximum of six regulator circuits via doubling for the GPU, plus one phase for the memory. We'll discuss it in more detail when we get to the efficiency-oriented tests.įor now, the gray bar represents the peak power consumption based on those load peaks that made it through to the smoother curve, in spite of our best efforts (which we described above). It’s based on a 170-second and highly varied Metro: Last Light scene (High preset, Tessellation set to Normal, SSAO Off). You'll notice that we added the average gaming power consumption at different resolutions, which is a different way of looking at things. Contact-free DC Measurement at PCIe Slot (Using a Riser Card) Contact-free DC Measurement at External Auxiliary Power Supply Cable Direct Voltage Measurement at Power SupplyĢ x Rohde & Schwarz HMO 3054, 500 MHz Digital Multi-Channel Oscilloscope with Storage Function 4 x Rohde & Schwarz HZO50 Current Probe (1mA to 30A, 100 kHz, DC) 4 x Rohde & Schwarz HZ355 (10:1 Probes, 500 MHz) 1 x Rohde & Schwarz HMC 8012 Digital Multimeter with Storage Function 1 x Optris PI640 80 Hz Infrared Camera + PI Connect
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