Intel's chip shipments rose 4.2 per cent year-on-year in Q2, while AMD's dropped 22 per cent and Nvidia's fell 12.7 per cent, according to estimates from Jon Peddie Research (JPR).
Overall, shipments dropped 4.5 per cent in Q2 year-on-year.
However, looking at quarter-on-quarter movements, overall shipments rose 3.2 per cent.
AMD's overall unit shipments increased 11 per cent quarter-to-quarter, Intel's total shipments increased four per cent and Nvidia's decreased 8.3 per cent.
The attach rate of GPUs (including integrated and discrete GPUs) to PCs for the quarter was 139 per cent (up 3.2 per cent), and 32 per cent of PCs had discrete GPUs, (down 3.6 per cent) which mean 68 per cent of PCs are using the embedded graphics in the CPU.
"Q2 is, on average, usually mixed, up slightly some years, down others," said JPR in a statement.
"There was an abnormal spike in 2009 after the massive market decline which warps the 10-year average to 7.1 per cent and makes the 3.2 per cent this year appear to be below average. If the anomalous 2009 spike is ignored, the nine-year average is just 0.5 per cent, which would make the 3.2 per cent increase for Q2 2014 a significant increase.
"GPUs are traditionally a leading indicator of the market, since a GPU goes into every system before it is shipped, and most of the PC vendors are guiding cautiously up to flat for Q3 2014.
"The Gaming PC segment, where higher-end GPUs are used, was a bright spot in the market in Q1. Nvidia and AMD high-end GPUs sales were strong, lifting the ASPs for the discrete GPU market.
"We expect the total shipments of graphics chips in 2017 to be 418 million units. In 2013, 438.3 million GPUs were shipped and the forecast for 2014 is 414.2 million."