Taken from Diablowiki which I cannot share the link to apparently.
Magic Find doesnât boost your odds of finding everything equally. It did in earlier versions of D2X, but as players realized the power of the modifier and began to specialize in it, Blizzard made some changes to scale back the effectiveness of the property. Itâs still quite useful, even at lower amounts, but thanks to the diminishing returns of magic find itâs not all that beneficial to specialize entirely in MF.
- A more detailed table (can be found on the same web page that I cannot link because I might be trying to 1337HaXX0RJ00)
| Magic Find |
Rare Find |
Set Find |
Unique Find |
| 50 |
46 |
45 |
41 |
| 100 |
85 |
83 |
71 |
| 200 |
150 |
142 |
111 |
| 300 |
200 |
187 |
136 |
| 400 |
240 |
222 |
153 |
| 500 |
272 |
250 |
166 |
| 750 |
333 |
300 |
187 |
| 1000 |
375 |
333 |
200 |
The actual % that is applied towards finding each type of item. Magical is full, Rare/Set/Uniques are less.
How much you want to wear should be based largely on these percentages. More always helps for magical items, so if you have 1000% MF virtually every monster will drop a magical item. Want normal items or socketed items? Not so much.
If you can get to 250-350% thatâs really all you need, in terms of finding Sets and Uniques at an increased rate. More after that generally doesnât make enough of a difference to be worth the equipment sacrifices, especially if you are playing Hardcore.
In addition to this, many monsters have unequal odds to drop the various qualities of items. Act Bosses have better odds to drop Uniques than anything else does, SuperUniques drop more uniques than random bosses, and so on.
I want to be clear on what the MF% is increasing. You didnât get that common dagger because MF is broken.
You got the common dagger because the monster had a 10% chance of it being magical, and you increased that value by 400%. Take your 10%, add quadruple the value (400%) and you get 50%. You had a 1 in 2 chance of it being magical instead of a 1 in 10 chance. say it had a 5% chance to be rare. 5%+(5%x240%)=17%. A little less than a 1 in 5 chance to be rare instead of 1 in 20.
As noted in the chart, the value is lessened for rares, sets and uniques.
MF does NOT affect runes. Ber rune with a 0% chance to become magical. 0+(0x300%)=0. But the MF will increase your odds of getting a Shako or whatever else that may drop while you pray for RNGesus to come save your time spent.
I hope this helps your decision on whether to run MF or not. Donât run 500% MF if you need to stand around waiting for your merc to kill everything. Try to keep your abilities killing enemies in 1-3 shots, add mf as acceptable. remove as needed. killing faster is better than killing with more mf.