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I read somewhere the Windows 7 had removed the limit on ReadyBoost from 4GB and now allows an unlimited number of GBs. I would like to reconfirm this as a fact.

At present, my Windows 7 RC 7100 allows me a maximum of 4GB on one of my 8GB flash drives (though I've tried to connect two at a time and use 4GB on one and 2GB on another).

Thanks!

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According to this comment for this post at Windows 7 News, someone is using 8 GB for Readyboost on 1 ExpressCard and 4 GB on 1 SHDC card at the same time.

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Thank you this answers my query correctly. I reformatted my 8GB flash drive using the exFAT format and then ReadyBoost allowed me to configure this drive for 8GB cache. Thanks and did the job! :) – ymasood Sep 7 '09 at 11:24
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I also found this on wikipedia :

Windows 7 allows up to eight devices for a maximum of 256 GB of additional memory.

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I don't know about "somewhere" but the Wikipedia ReadyBoost article supports that:

Windows Vista x86 is limited to using 3.5GB (Vista x64 can support up to 16GB); this restriction has been removed in Windows 7.

and

The initial release of ReadyBoost for Windows Vista supports one device. Windows 7 supports multiple flash drives for ReadyBoost.

However, I can't find anything on the Microsoft site, which isn't encouraging.

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Multiple flash drives sounds nice, didn't know of that yet (if it's true), thank you! :-) – Tom Wijsman Sep 7 '09 at 9:27
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ONLY if you have LESS THAN 2 GB of RAM on your computer, enable ReadyBoost for your USB flash drive to cut down on the number of hard drive accesses Windows makes.

A 512 MB to 3 GB ReadyBoost.sfcache file should be adequate.

Tests have shown that there is no benefit to using ReadyBoost if your computer has > 2 GB of RAM and there is no need to use more than one USB drive. If you have a spare 4 GB or less USB flash drive you could use the whole drive and plug it into the back USB port for aesthetic reasons.

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not true, the benfit of ReadyBoost is when you don't have enough ram to hold all the dlls the apps your are running make use of, so it very match depends on your workload. However if you have under 2GB of ram and can't upgrade then ram, then get ReadyBoost TODAY! – Ian Ringrose Jul 18 '10 at 8:25
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Official information from Microsoft can be found on the Windows 7 Product Website with additional information available on TechNet. I'm sure some searching might reveal even more information from Microsoft, but for a start this should be sufficient.

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