The best-performing technology stocks of 2013 were the following (listed alphabetically): Micron Technology Inc., Hewlett-Packard Co., Advanced Micro Devices Inc., Electronic Arts Inc., and Seagate Technology PLC/Western Digital Corp.

According to Finviz.com, Micron Technology's shares increased 126% and 50% during the first half and second quarters, respectively. Micron closed the last quarter at $14.3.

Hewlett-Packard was still a top performer; however, in the second quarter, its stock rose 7% only. Although the end of the quarter saw Hewlett-Packard close at $24.80, consensus price target is only at $22.81.

Advanced Micro Devices share went up by 70% as of the year to date, but most of this gain was in the second quarter. Its stock was priced above its consensus price target at $4.08.

Electronic Arts has gained more than 58% so far, with second quarter performance gaining more than 28%. Electronic Arts closed the second quarter at $22.99.

Seagate Technology and Western Digital had a close fight. Seagate gained more than 48% while Western Digital was behind by only half-percentage point. Seagate closed at $44.83 and Western Digital at $62.09.