ati overdrive频率限制能否破解

Cavin

ati overdrive频率限制能否破解？
好象是要改BIOS，可不知改的是哪一项，还有改A卡BIOS哪个软件好点
请求高手解答

ufoshi

我看能 这里的人也就这点水平

Sirlion

这可不是一点水平就搞的定的
RBE的作者已经强调过这个问题了
bios里面控制超频上限频率是有一个加密机制的
现在的方法是只有把官方提供给某些特殊的型号的bios中，把这个加密证书取出来，放进其他型号的bios中，才能突破超频上限，当然，数值还是由官方控制。

这是RBE的原文，连他都做不到，何况这个论坛的，你不能说这个论坛的用户做不出系统就不让他们用的。

Urgent information on overdrive increase

What is this all about? Maybe you tried overclocking your card using overdrive and found yourself running into the upper limit there. ATI implements this limit into their cards to assure the video card vendors don't overclock their chips too much. They just want to have an overview over the market and maybe, want to participate in the more expensive OC edition cards. Thus, the video card vendors make a video card, create a BIOS for it and send this BIOS to ATI. ATI approves the BIOS (or not), adds a signature to it and sends it back to the vendor. Only then the vendor can produce and ship the card, this is not possible without that signature. The signature mentioned is an encrypted key. The overdrive limit in the BIOS is protected by this key. It can be changed, but if so, the key won't match any more which makes the catalyst driver not recognize the card any more and therefore, this BIOS is unusable. RBE can't decrypt this key, but it can transplant an overdrive limit and its key to another BIOS.
Even though this is an attractive method, it has some disadvantages:
1) There must be BIOSes with increased limits and matching signatures. So far, RBE's author is not familiar with so many such BIOSes.
2) The area that needs to be put into the BIOS contains the deviceID, also. If you are keen enough to put a HD 4850 hash into a 3870 BIOS for example (not recommended, though), be prepared for strange things to happen: Programs that make decisions out of a card's deviceID (just like RBE for example) will be fooled then, of course. Maybe you will have to install the matching catalyst for the new card (in this case, the one for the 4850) after flashing and rebooting. But of course, the 3870 is still a 3870, not supporting many things the 4850-catalyst expects to work. Please try not to mix up video card types, at least not among the video card generations (like 3xx0 and 4xx0 for example). The key matching your card best will be suggested by RBE automatically.

_______________________________________________________________________________________

As you can see, there are two methods offered. The first one takes all the stuff described above into account. It's the safer variant, but only available for several video cards. If you can select 'method 1' and 'change to these values', your card is supported. The second method won't take care of the signature described. It will simply change the (protected) overdrive clocks to the values entered. While this can be done to almost any video card, keep in mind that the key won't match any more after changing the limit that way. Some card/Catalyst combination might work however, at least there are reports on the internet that they do. Just try if it works for you if method one is not available for you.

You can also use the 'Load...' and 'Save...' buttons to rip off signatures from BIOSes or to feed RBE a signature file it may not know yet. In the TechPowerUp.com forums there is a thread you can post your signature files to or download interesting signature files from. Just click the TechPowerUp.com logo in the top left of the RBE main window to get there.

cyluoyan

确实很难，试过用十六进制修改BIOS，无效。。。

ufoshi

我看过一个方法 你修改上线以后会出现驱动无法安装成功的问题

这是因为你先前已打开VPU超频锁造成的  你可以尝试 重新安装新系统看看 听说BIOS和驱动程序有优先级 一定要在未打开VPU超频锁的前提下再去改超频限制最大值才有可能有效！

不知道这个方法可不可行 我是时间去测试

seangaoxi

用RBE直接改是不行的，因为AMD对BIOS内频率附有加密字串，直接改数值的话驱动会不认。

不过你要是有留意较新版本的RBE在改OVERRIDE上限的页面提供了选项1 HASH，也就是用欺骗的方法可以成功改动。我参考RBE的说明又看了techpowerup上别人的做法，试了下能可以改频率而驱动正常。

先达致计划一下你期望超上去的频率范围。到techpowerup的BIOS页面下一个同芯片符合数值要求的BIOS，不过注意接口类型及显存品牌，避免出现接口失效和黑屏的问题。

用RBE打开该BIOS，在HASH选项中选择保存，出来的是.rbe为扩展名的文件，内面包含频率上限数值及对应的加密串。

在修改显卡OVERRIDE限制时直接把这个rbe文件load进去就行了。

rhwood

不就是刷bios么，这么玄乎。。。效果视乎体质。

wssnsz

{lol:] 光刷bios没用的,不知把4870的rbe文件刷进去有没有用.希望有保修方便的试试.

[ 本帖最后由 wssnsz 于 2008-11-23 00:44 编辑 ]

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