RTX 5000: the right power supply with and without 12V-2×6 adapter 3 comments
Power to the RTX-5000 graphics cards continues to flow through a 12V-2×6 connection. Even though the power supplies do not have to follow the ATX 3.1 standard and do not have to provide the new connector natively, there are restrictions to meet the performance requirements cultivated with permanent up to 575 W (TDP).
Not all 12V-2×6 cables work with RTX 5090
Power supplies that provide a 12V-2×6 connection by themselves may be encountered in the cable or internally in the electronics in such a way that they provide only a fraction of the 600W continuous power that allows the system to operate. plug-in to the maximum. This coding takes place electrically via two of the four false contacts.
SENSE0 SENSE1 INITIAL POWER PERMIT
to the power of the system
After software configuration GND GND 375 W 600 W Open GND 225 W 450 W GND open 150 W 300 W open open 100 W 150 W
Depending on the BIOS configuration of the graphics card, it may happen that when powering on a low performance level, the boot process is completely refused, as is the case, for example, with an RTX 5090 and 4090, provided that 300 W or less power is supplied. And otherwise the enabled cable should always exceed the power target (usually the TDP or TBP) of the graphics card so that this is not permanently downgraded by the graphics card BIOS to the permanent performance of the cable.
The power supply manufacturer therefore specifies either as a label on the cable or in the technical data which service can be provided via the 12V-2×6 connection.
The 8-pin PCIe adapter should not be overloaded
If the power supply only has 8-pin PCIe plugs, the adapter enclosed by the graphics card three or four times 8-pin PCIe can be implemented on the 12V-2×6 socket. In one case, the adapter reports an available performance of 450 W, in which the other 600 W.
Adapter configuration options for Corsair Power Supplies (Fig.: Corsair)
With modular power supplies, however, care must be taken to ensure that the cable strand is not overloaded, provided that it carries a Y branch to two PCIe plugs. Corsair allows dual occupancy of such a cable strand only for Type 4 and 5 cat assemblies (these have been standard since model lines circa 2013).
ATX-3.x Power Supply can buffer peak load buffer of dual rated output
For power supplies that follow the ATX 3.0 or 3.1 standard, there are increased requirements for dynamic resiliency of the 12-volt rail. As a result, the voltage of this rail should not collapse even when the supply is doubled for a short time. Or the output voltage may briefly be lower than ATX 2.x, but the power supply protection circuits should not resolve incorrectly. Since the load peaks are intercepted in the power supply condensers, according to the new standard there is a minimum support time of 12 ms. In particular, entry level power supplies according to ATX 2.x often miss this requirement.
CyBenetics and PPLP.info Evaluate Load Shifting Capabilities – Intel with Compatibility List
Although ATX-3.x power supplies can be measured much closer to the required continuous output of all system components in total, a safety margin must be included for ATX-2.x power supplies for ATX-2 power supplies .x. Certification points such as CyBenetics or PPLP.info rate power supplies to handle dynamic loads based on their capacity, but of course make no guarantees of concrete compatibility. With the power selector, Intel maintains a compatibility list with which only compatibility is given to dynamic loads coming from the CPU. The 12V-2×6 connection is only specified for its continuous performance.
Angle caps are not compatible with all model variants
Seasonal 12V-2×6 Installation Instructions (Image: Seasonal)
Since a huge cooling capacity of graphics cards with TDPS is required of more than 300 W, these have increased significantly. Since only a few of the 12V-2×6 connection to the side panel of the case remain, various power supply manufacturers offer angle plugs, otherwise the cable would have to be bent. Overly tight bend radii are also negotiated as the cause of error for an overloaded connector, which is why in systems with limited installation space, a discarded connector should be preferred. With the Founders Edition, Nvidia encounters the problem by assembling the connector upright and diagonally. For most custom models, however, there is still the problem, so compatibility must be checked separately in case of angle plug.
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Hugo analyses PC power supplies, evaluating their efficiency, reliability, and compatibility with various builds.
