Four RTX 5090 LLM rig melts UK mains plug and socket, 12V-2x6 connectors survive
A Reddit user posting as u/Zo0x78 reported that the main power plug and wall socket on a four-GPU RTX 5090 LLM workstation melted during tuning, while all four 12V-2x6 connectors were undamaged, as relayed by Wccftech and cnBeta. The rig has 128GB of GDDR7 memory and can run 120B-parameter models with quantization; the four cards draw 2,300W–2,500W at full load and whole-system continuous power is around 2,800W, close to the roughly 3,000W ceiling of a UK 230V 13A socket. Commenters disputed the cause, citing poor plug-to-socket contact or subpar plug or fuse quality, and the owner advised other quad-RTX 5090 users to power-limit their GPUs, while some commenters said 16A or 20A industrial sockets are needed.
The owner's account indicates that a quad-flagship-GPU LLM workstation can push a standard UK 13A wall socket close to its physical limit, prompting commenters to call for 16A or 20A industrial sockets.
近日一位Reddit英国网友发帖分享自己在调试其四卡RTX 5090 LLM工作站时遭遇惊险一幕：主电源插头与墙面插座被熔毁，13A保险丝也未能顶住负载，反倒是四张5090上的12V-2x6接口全部安然无恙。
据了解，这套配置拥有128GB GDDR7显存，可在量化后流畅运行120B参数的大模型，但四卡满载功耗高达2300W–2500W。
再加上CPU及其他组件的功耗，整机连续运行功率约在2800W左右，已逼近普通家用插座的承受极限。
事故现场的照片显示，电源线的总线插头已经发生严重形变并融化，墙上的插座也因高温受损，插头内部的13A保险丝显然未能起到预期的保护作用。
要知道在英国标准的230V电力环境下，13A插座的最大承载功率约为3000W，2800W的持续输出已经无限接近插座的物理极限，任何细微的接触电阻都会导致剧烈发热。
#NVIDIA#GeForce RTX 5090#12V-2x6 connector#12VHPWR connector#GDDR7