The GeForce RTX 4090 is palms down the greatest graphics card that cash can purchase in the intervening time. Sadly, whereas the Ada flagship graphics card is okay, the included 4×8-pin to 1×16-pin energy adapters reportedly pose a hearth hazard, based on a number of person suggestions.
Beforehand, two GeForce RTX 4090 homeowners have reported experiencing 16-pin energy adapter meltdowns. Each owned customized fashions, with the primary proprietor rocking a Gigabyte GeForce RTX 4090 Gaming OC and the latter person with an Asus TUF Gaming GeForce RTX 4090 OC Version. The third report comes from a Fb person (by way of Hassan Mujtaba (opens in new tab)), who coincidentally has an Asus TUF Gaming GeForce RTX 4090. In keeping with the proprietor’s recount of the info, he was benchmarking when he smelled the smoke from the facility adapter. Happily, he might pull the connector out earlier than it did any harm to the graphics card.
Nvidia has launched an investigation into the matter, and with good purpose, since meltdowns are beginning to grow to be widespread. The person suggestions reveals that the issue could reside with the design of the 12VHPWR energy connector. Bending the cables too near the connector seemingly causes some terminals to loosen up, resulting in uneven mating. As well as, it unbalances the load throughout the opposite terminals. PCI-SIG documented the potential thermal variance concern lengthy earlier than the 12VHPWR energy connector debuted on the GeForce RTX 4090. Subsequently, it actually comes as a shock that the issue continues to be current on the completed product.
In keeping with the PCI-SIG slides, which Seasonic shared on its Bilibili account (opens in new tab), the requirements physique acknowledged that a number of suppliers and designs failed the checks. Cables, even when they’ve low cycles, did not fail so long as they weren’t bent. PCI-SIG examined the cable bending downside at roughly 30mm from connectors to the graphics card and energy provide. Nonetheless, even at that distance, PCI-SIG noticed related meltdowns. Exceeding 40 connection cycles on the connector additionally trigger the issue. Do observe that PCI-SIG examined on a “benchtop/lab” atmosphere, which we assume is an open-air take a look at bench. It isn’t the identical setting as a standard PC case, however the outcomes are what is important right here.
PCI-SIG’s checks revealed that the facility connector was overheating on the mating level. The issue affected each rows of pins. PCI-SIG carried out the checks at an ambient temperature of 26 levels Celsius and took readings from the new spots at 2.5 hours. The top of the cable related to the facility provide confirmed readings between 51.3 to 52 whereas the top to the graphics card peaked at 150.2. PCI-SIG noticed melting between 10 to 30 hours. The unbalanced present resulted from the resistance variation between the completely different pins. The requirements physique famous that bending led to excessive resistance within the different pins, inflicting the present to switch to the bottom resistance.
When excessively bending the cable, the lack of mating contact can occur to 6-pin or 8-pin PCIe energy connectors. It’s nothing new. Nonetheless, the issue appears extra prevalent with the 12VHPWR energy connector so customers ought to pay further consideration to the set up. Customized cable producers, equivalent to CableMod, suggest a minimal distance of 35mm from the connector earlier than bending the cable.
German publication Hardwareluxx (opens in new tab) has gotten its palms on energy adapters from Nvidia, be quiet!, and Asus. Sadly, the adapters have completely different designs. Out of the three reported meltdowns, one was from Gigabyte, and the opposite two had been from Asus. With out extra circumstances, it’ll be onerous to pinpoint if a selected OEM is at fault, although. As well as, three Hardwareluxx discussion board customers have reported issues with the be quiet! adapter. One person reportedly connected a cable tie at a 40mm distance from the connector, however one of many pins nonetheless got here out simply. Be quiet! has changed the person’s adapter and can examine the problem.
GeForce RTX 4090 homeowners ought to in all probability recheck their graphics card’s set up and keep away from bending the cable for the 16-pin energy adapter the place doable. Hopefully, Nvidia will resolve the problem rapidly and supply customers with an answer.