Remember the IdeaCentre Horizon, the 27-inch tabletop touchscreen PC? Lenovo sure does as it presents the Yoga Home 900, an upgraded version of the concept featuring better internals and Windows 10 as OS.

Described by the company as a "portable All in One PC," the Yoga Home 900 features Intel Core i7 processor, Nvidia GeForce 940A graphics, 1TB SSHD and a battery allowing up to 3 hours of unplugged use (thus the "portable" in the description). It weighs around 7kg and also includes a kickstand, 3 USB ports, 1 HDMI port and Bluetooth 4.0 connectivity.

Apple announces a refresh of the iMac lineup, one complete with a 21.5-inch model with an optional 4K display and 27-inch models updgraded with 5K Retina displays and Intel Skylake CPUs.

The 21.5-inch iMac has a 4096 x 2304 resolution display armed with an sRGB-based panel Apple claims provides more lifelike colours through a P3-based colour gamut and 25% larger colour space. It is powered by a 5th generation Intel Core processor (up to quad-core 3.3GHz Intel Core i5) and Intel Iris Pro graphics, while connectivity comes through two Thunderbolt 2 ports and 3-stream 802.11ac wifi.

Storage ranges from 1TB HDD to 1 or 2TB Fusion Drives or a 512GB SSD.

Georgia Tech researchers propose a means to add liquid cooling directly to processors, eliminating the need for heat sinks or cooling fans, by cutting microfluidic passages in chip dies before pumping water right through.

Initial tests involved "popular" 28-nanometer chips from Altera, and show promising results-- the researchers say "monolithically-cooled" chips operate at temperatures 60% below those of similar air-cooled chips. The aforementioned microfluidic passages are 100 microns in diameter and just few hundred microns away from the chip transistors. A silicon layer seals the fluid passages (except for an inlet and outlet), which carry regular de-ionised water.

Water is pumped into the silicon passages at a temperature of 20°C with an inlet flow rate of 147 millilitres per minute, and allows the chips to run at a steady 24°C.

Acer presents a pair of different takes on the Windows 10-powered PC-- the Aspire Z3-700 portable All-in-One (AiO) PC with a built-in battery and the Aspire R 14 hybrid notebook offering 4 usage modes.

The Z3-700 has a built-in battery allowing for up to 5 hours of use as an oversized tablet on a single charge. It features a 17.3-inch 1920x1080 resolution touchscreen, is 15.6mm thin and weighs 2kg, with 2 kickstands allowing it to either stand or lay flat. Powering the device are Intel Pentium or Celeron CPUs, up to 8GB RAM and either SSD or HDD storage.

Also included is a stylus for more precise control.

Gartner reports global Q3 2015 PC shipments total 73.7 million units-- a -7.7% Y-o-Y decline brought about by price increases caused by the sharp appreciation of the US dollar affection regions including EMEA.

Thus the analyst says EMEA PC shipments are down by -17.4% Y-o-Y, reaching 20m units. Currency devaluation is the major cause of such declines, together with weak back-to-school sales following the delay of September device launches in the name of high inventory clearing.

However, without currency issues the Q3 2015 PC market remains fairly gloomy, with desktop PCs showing weakness with a "high-single-digit decline" while combined notebook and premium ultramobile declines are "low-single-digit."

Arctic launches the Freezer i32 and A32-- the first two semi-passive coolers from the company, described as smaller and lighter updates on the Freezer i30/A30 coolers.

According to the company the coolers feature a "sophisticated fan controller enables that the CPU is completely passively cooled during typical Windows operation." In other words, the built-in F12 PWN 120mm fan does not kick in when PC goes through tasks such as office productivity, web browsing or video watching.

Instead the fan starts running when CPU temperatures get high (from 40% PWM), ensuring quiet operation and increased service life. Maximum capacity reaches 320W, and the coolers are designed for use with Intel/AMD CPUs up to 150W.

Hdplex details the upcoming H5 chassis-- a fanless ATX chassis with a headline CPU passive cooling ability of 95W TDP, making it usable with PCs using up to and including Intel Skylake-K CPUs.

Cooling comes through 16 heatpipes (a first according to the company), with the option to use 8 heatpipes to cool the CPU and the other 8 for any discrete GPU. In addition it also uses weighty copper heatsinks and aluminium-finned warm air dissipators.

Everybody's eyes might be on the September Apple event, but rumours suggest the company has more surprises in store-- according to 9to5Mac the company plans to launch a 21.5-inch iMac with a Retina Display come October 2015.

Propping such claims are a configuration files hidden within the beta releases of OS X 10.11 El Capitan.

The Retina Display in the 21.5-inch iMac is said to handle 4096x2304 resolution-- making for a pixel density of around 218ppi, the same as the 27-inch iMac with 5K Retina Display. The current 21.5-inch iMac has 1920x1080 resolution.