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OVERCLOCKERS earlier this week tested a number of thermal pastes to see if the compounds included any silver.

The chemistry experiment was applied to Arctic Silver 5 and 3, OCZ Ultra II Premium Silver Compound and CompUSA Silver Thermal Grease.

According to the site, it's come up with some "very disturbing results" – it claims that there's no silver in the OCZ and the CompUSA greases.

But the tests show that Arctic Silver 3 and 5 did contain silver.

The results are here, while the site also has had the products tested by an independent lab.

Meanwhile, OCZ reacted rapidly to the tests, and issued a product recall notice, which you can find here. It said that it doesn't manufacture its thermal paste itself, but takes full responsibility for the problem. It has signed a deal with Arctic Silver, and said it is issuing a full product recall of OCZ Ultra 2.