8400和8600严重缺陷，一旦过保我们就有的忙了

NVIDIA空前大危机 所有G84和G86存有致命缺陷
( n% h9 d* c, [& P买了8系列显卡的笔记本现在就可以默哀了 Nvidia 上一代笔电 GPU 出问题,已经对股价造成了极大的影响,但一个多礼拜过去了,对一般人而言最重要的问题还是没有答案:到底出问题的是哪些 GPU 啊?据 The Inquirer 躲在 Nvidia 的内线的消息,是所有的 G84 和 G86 芯片,桌上型、笔电型都算,句点.这绝对是 Nvidia 空前绝后的大危机.据 The Inquirer 挖出来的情报,出状况的原因,是 G84 和 G86 共享的 ASIC 使用的黏着材料(之类的)在热膨胀系数上和其他组件不相同,导致每次的收缩膨胀都会让键结松脱一点,长久下来当然芯片就挂了.经常性的加温减温会让问题更 加快速的显现出来,这大概也是为什么 Nvidia 先前只说笔电的原因 -- 笔电为了省电,经常会调控 CPU 和 GPU 的出力,因此温度变化会远比开了就一直热着的桌上型 GPU 要剧烈.目前的解决方法(在 BIOS 里强制开启风扇)根本只是降低温度的变化率,以求能延长这两颗芯片的寿命到超过保固而已.这方法不仅治标不治本,而且对电池耐力有很大的影响.对买了相关产品的用户来说是相当不负责的态度.The Inquirer 这篇报导有点耸动,但 Nvidia 目前处理整件事情的态度,却让人不得不觉得这种说法有一定的可信度.我们到现在还在猜测出问题的是哪一批产品本身就是个问题:Nvidia 什么都不说明,不说明是什么产品出问题,不说明是为什么出问题,不说明影响范围有多大.为什么不说?是一旦说了 Nvidia 就完了吗?我们目前唯一知道的,就是 Nvidia 预留了两亿美元来擦屁股,但如果真的所有的 G84/G86 芯片都有问题,那我们现在看到的恐怕只是冰山的一角而已,随着时间的经过,出问题的笔电只怕会愈来愈多,更何况还有桌上型的显示适配器呢?两亿,够吗?
也就是说,所有的G84和G86都存在这个缺陷，只不过由于笔记本显卡为了节能不断调整自身的电压和频率的行为会使这个缺陷迅速暴露。Nv花的2亿美金估计摆不平这事。按照文章的意思应该是在一年或者更长的时间后，所有G84和G86都会挂掉。买了8系列显卡的笔记本现在就可以默哀了，桌面型因为温度变化较小，可以多活一段时间。All Nvidia G84 and G86s are badhttp://www.theinquirer.net/gb/in ... idia-g84-g86-badG84 系列8600GS8600GT8600GTS8600M GS8600M GT8700MGTG86 系列8300GS8400GS8400M G8400M GS8400M GT8500GT 外国网站消息：
All Nvidia G84 and G86s are bad
3 O) M  N  h: m) y- SComment No word on MCPs yetBy Charlie Demerjian: Wednesday, 09 July 2008, 5:43 PM THE BURNING QUESTION on everyone's mind is what Nvidia parts are failing in the field? No GT200 jokes here, NV personnel are still quite sensitive about that, but our moles have told us about the bum GPUs.The short story is that all the G84 and G86 parts are bad. Period. No exceptions. All of them, mobile and desktop, use the exact same ASIC, so expect them to go south in inordinate numbers as well. There are caveats however, and we will detail those in a bit.Both of these ASICs have a rather terminal problem with unnamed substrate or bumping material, and it is heat related. If you ask Nvidia officially, you will get no reason why this happened, and no list of parts affected, we tried. Unofficially, they will blame everyone under the sun, and trash their suppliers in very colourful language.The press is totally stonewalled, but analysts are quite another story. If you call up with Wall Street credentials, they will tell you what is going on, but unfortunately it doesn't seem to be entirely accurate. What analysts tell me they were officially told is that it is a specific batch of parts that only HP got.The official story is that it was a batch of end-of-life parts that used a different bonding/substrate process for only that batch. Once again, the trusty INQUIRER bullshit detectors went off so loudly that the phone almost vibrated out of my hand. More than enough people tell us both the G84 and G86 use the same ASIC across the board, and no changes were made during their lives.When the process engineers pinged by the INQ picked themselves off the floor from laughing, they politely said that there is about zero chance that NV would change the assembly process or material set for a batch, much less an EOL part. On the less technical side, multiple analysts also told us that NV specifically told them that this problem is confined only to HP. I wonder why Dell is having failures in huge numbers for their XPS lines and replacing them with ATI parts? Why is Asus having similar problems? Go check the message boards, any notebooks that came with G84s and G86s have boards filled with dead machine problems. Most of these, especially on the NV forums are being quashed and removed by admins, so act quickly and take screenshots of your posts.Basically, NV seems to have told each analyst a highly personalised version of the story, and stonewalls everyone else who asks. Why? The magnitude of the problem is huge. If Dell and HP hold their feet to the fire, anyone want to bet that $200 million won't cover it? This has all the hallmarks of things the SEC used to investigate in a time before government was purchasable.The other problem is the long tail. Failures occur due to heat cycling, cold -> hot -> cold for the non-engineers out there. If you remember, we said all G84s and G86s are affected, and all are the same ASIC, so why aren't the desktop parts dying? They are, you are just low enough on the bell curve that you don't see it in number that set off alarm bells publicly yet.Laptops get turned on and off many times in a day, and due to the power management, throttle down much more than desktops. This has them going through the heat cycle multiple times in a day, whereas desktops typically get turned on and off once a day, sometimes left on for weeks at a time. Failures like this are typically on a bell curve, so they start out slow, build up, then tail off. Since laptops and desktops have a different "customer use patterns", they are at different points on the bell curve. Laptops have got to the, "we can't bury this anymore" point, desktops haven't, but they will - guaranteed. The biggest question is whether or not they will be under warranty at that point, not whether or not they are defective. They are.If you look at the HP page, the prophylactic fix they offer is to more or less run the fan all the time. Once again, for the non-engineers out there, fan running eats a lot of power, so this destroys the battery life of notebooks. Basically, people bought a machine with a battery life of X, and now it is Y to prevent meltdown from a bum part. It doesn't fix anything, it just makes the failures take longer, hopefully past the warranty period, at a huge battery life cost. Fire up your class actions people, you got shafted.Back to the engineering, we intoned that this was a cover-up of engineering failures by Nvidia. We also said that they probably knew what was happening. Think we were kidding? Read this, twice, linked again here for those that can't move their mouse to the left, it is that important. If we knew a year and change ago that these exact parts had heat problems, think Nvidia did? Think the voltage difference between A02 and A03 is coincidence? This is a classic example of not meeting engineering goals and overclocking through brute force (voltage bump in engineering terms) to compensate.HP and the others were blindsided by this, it happened far too late in the design cycle to compensate, and it looks to have been covered up hastily, badly, and eventually fatally. Blaming suppliers, OEMs and users is completely unfounded and says that NV is unwilling to properly address this issue, only hide from it. NV knew, they made silicon changes to fix another problem that directly lead to this problem.Nvidia is covering this up, hard. All the usual sources are keeping mum on the topic with only a few daring to speak out. Given the sheer magnitude of this, their marketshare for notebooks was huge in the period, this could very well suck up most of their remaining cash. Don't underestimate how bad this is going to be for NV, we highly doubt $200 million will even begin to cover it. Told ya so. µ
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