I had originally ordered 3 of the Jdata DDR3 1333 ram (which actually cost much more)her on Overstoack. Installed them and I had one module bad right off the bat. Returned it and when I installed the replacement, one of the other modules failed.

A bit tough to find this stuff, but works and decent price for it too.

Went from 4GB to 8GB on Win 7 Pro. Increased speed on 30 min job by a third.

I bought two of these for a Dell XPS 8500 with Win 10 Pro that only had 8GB of memory. No more low memory warnings! The additional memory seems to work OK. CPU-Z says the Kingston modules are single rank while the Dell OEM memory sticks were dual rank.

Kingston's ValueRAM range rules the roost when it comes to no-frills budget memory, and the KVR1333D3N9K2/8G kit is a perfect example. For less than £80, you get a pair of 4GB modules of DDR3 RAM, rated at 1,333MHz.

Made from the highest quality components, ValueRAM ® memory modules for notebooks are designed to improve the reliability and performance laptops, collected by the users. Over time, increased speed and reliability allows to further increase efficiency in the overall decline in the cost of purchasing...

They are shorter than normal DIMMs; about the same height as the clips that hold them in. This is useful in some small cases or if your big CPU cooler is getting in the way.

They work at the rated speed; and the system is stable during stress tests

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If you are in the market for DDR3 memory you probably are not talking about upgrading a new laptop, but putting a bit of zip into a full depreciated one. All i can say is that this 4G kit put a noticeable bit of life into an 9 year-old Toshiba Portege, bringing the 6Gig up to 10G . . .