If it doesn't work and it might not, (it's never a good idea to mix sets of DRAM, even the same exact model, it can be problematic. This is why there is such a large assortment of DRAM sets available, those sticks in a packaged set are tested to work together, you might pull 10 sticks right off the assembly line and not find 4 that will all play nice...If you get them and have problems, give me a shout and we can try some minor voltage and timing adjustments