The wholesale cost of memory is set to rise during August, reports the Far East Nikkei news agency.

Quoting figures from analyst firm ICIS-LOR, the report states that the average wholesale price for 256MB of memory rose 4.35 per cent in the US, 3.84 per cent in Europe and 1.63 per cent in Asia in a 30-day period preceding July 18.

Apple is adopting double-data-rate memory in many Macs. The report states that the average price of this component continues to rise, attributing this to "strong demand".

The memory market is notoriously volatile, meaning major computer manufacturers agree component terms contractually in advance. As Apple's arrangements with memory vendors are unknown, it's unclear whether memory price-increases will impact on margins.