The Corsair Obsidian 750D has proved itself to be a great air cooled solution for gaming enthusiasts. The rig has been very cool in operation. Cooler hardware tends to last much longer affording more time to scrape up funds for upgrades rather than constantly replacing damaged parts. Installing fans pay for themselves with better performance. Warm machines cannot use CPU & GPU boost effectively as the thermal throttle limits max clock rates.
The performance of the machine has improved incrementally. The primary reason is that as consoles gain performance the PC has to keep up. Video cards are the most costly component today.
|Chassis||Corsair Obsidian 750D Airflow Edition|
|Motherboard||MSI X570-A PRO|
|CPU||AMD Ryzen R5 3600|
|CPU Cooler||Corsair H115i PRO RGB|
|Memory||G.Skill Flare X DDR4-3200 4x8GB 16-18-18-39|
|System Storage||Samsung 980 PRO 2TB (See below)|
|Graphics Hardware||EVGA RTX 2080 Black Edition|
|LCD Display||LG 27UL500-W|
|Mouse||Zelotes F15 Wireless Gaming Mouse|
|Digitizing Table||Wacom Graphire CTE-630BT|
|Keyboard||Corsair K55 RGB|
|Controller||Xbox Carbon Black|
|Operating System||Microsoft Windows 11 Professional x64|
The Corsair Obsidian 750D Airflow Edition is well made and very reliable. Adding a third cage fits the chassis perfectly with the DVD bay holding the top in place. Clearly the design is well considered.
The disk cages are about the same thickness as a front mounted water cooler and trying various video cards all fit fine. Triple fan video cards are longer than the older dual fan cards which makes then closer to 12 inches long.
The old R9 Fury is a triple fan card that has more shader than the RTX 2080 but the clock speed is only half as fast. Some recent Radeon cards are now triple fan and recent GeForce cards are also triple fan. The larger 750D handles large video cards easily.
The space in the Obsidian 750W is impressive. Even with 3 disk cages stacked along the front of the machine there is still rome galore for even 13.6″ video cards with room to spare. This is the reason full tower chassis are popular as due to the flexibility. The space is adequate for dual video cards but lately modern cards are now so powerful that one card can do the job.
MSI motherboards have been relatively reliable. Lower cost Asus boards have not survived nearly as well as MSI motherboards. Socket, 5, 7, 939, AM2, AM3 and now AM4 have been in use. Eventually AM5 will be available.
The MSI X570-A PRO has lasted for over 24 months in service which is not bad considering the average life of motherboards in the studio. MSI seems to be excellent quality and Hardcore Games recommends them as a safe choice. AMD handles the BIOS so do not fault MSI for problems.
Triple slot cards now cover the top PCIe x1 slot which is why its designed to be switchable. This then allows the remaining slots to be used for peripherals such as USB cards etc.
AMD went through several generations of socket AM4 processors and chipsets. The Obsidian 750D is spacious enough to allow for a relatively easy motherboard change.
The range of video cards available varies over time with procurements made when digital coin values collapse. Old cards are bought for 10-25 cents on the dollar which saves the studio a fortune. Other video cards are procured privately.
The Sapphire Toxic Radeon RX 6900 XT is a powerful gaming card. The RDNA 2 architecture is the same as the Xbox Series X and PS5. This makes contemporary games run efficiently with no real problems for shader compatibility. Sapphire last offered a Toxic card with the R9 390 but the studio went for the more powerful R9 Fury.
DX112 Ultimate support means 100% game compatibility. DX12 DXR is filly supported with RDNA 2.
Video cards have accumulated. This is driven by the annual marketing by AMD and nVidia selling new cards every fall. Now that GDDR6 is ramping up, new cards are coming to market now supporting it. The RX 6900 XT with 16GB of GDDR6 allow games the options for any shader desired.
More recent cards are now pushing power loads above 400W which really drives the need for extreme cooling in addition to power supplies. While the RX 6900 XT is air cooled the card is also available with a 360mm water cooler attached.
The Outer Worlds is relatively demanding with the open world design but the VRAM question suggests that 8GB can bump to 12GB or 16GB but the real beef needed is simply more CUDA cores.
The AMD Ryzen processors are very powerful and they can handle even elite graphics cards. The R5 3600 with 6 cores and 12 threads is quite adequate for handling even the most demanding games. The R5 3600 easily reaches 4.2+ GHz when the workload is high.
The AM4 platform has 48-bit address lines which supports up to 256TB of address space. Early on Microsoft has supported memory mapped files which could potentially be on a large scale file system.
The Corsair H115i is a 280mm class water cooler for personal computers. The water cooler has a thermal load of 300W which far above the most demanding processors sold in the market. AMD Zen 2 processors are 65W and 105W. Some recent Intel processors are 125W.
Water cooling is too expensive for mainstream consumers. Prices are high due to patent licensing fees and ongoing litigation.
The 32GB of DDR4-3200 is far above the mainstream which is still largely using 8GB. The goal with more RAM is to handle the most demanding modern games which are increasingly taking advantage of resources. The X570 can support 128GB maximum but in practice 32GB is abundant.
Only very recently have games wanted more than 8GB of RAM. Some titles are now recommending 12GB or16GB of RAM. One of the drivers of recommending more RAM is the Xbox X|S and PS5 which both have 16GB. The PC video card has its own storage which is above and beyond main memory.
The 750D has room for 9 hard disks and 3 DVD bays. There is a 4 disk bays for 2½” SSDs raising the capacity to 13 disks/SSD. AMD is know to support at least 10 SATA ports but usually only 6 are provided. SATA cards are widely available for supporting more storage at the expense of a PCIe slot. 16-port controllers are inexpensive.
The Samsung 980 PRO is PCIe 4.0 and it is fast enough to saturate the slot. Samsung was late to deliver the 2TB capacity. Boot times with the 980 PRO are less than 20 seconds from cold start. Benchmarks show the Samsung 980 PRO to be the most popular NVMe SSD today.
|Estimated MTBF is greater than||141,874 hours|
|Average operating hours||15,047 hours|
|Annual Failure Rate||5.99%|
|Average operating (years)||1.72 years|
The old Intel 665p SSD is PCIe 3.0 based which is the same as the old 660p SSD. The existing 2048 GB SSD has demonstrated its value. Larger capacity SSD products are inevitable as the prices fall for existing products. Hard disk survival has been less of a problem as well. The NVMe SSD has revolutionized the performance of gaming. Loading Windows is substantially faster and game performance is improved as well. This is the reason consoles have jumped onboard too.
|CAGE LOCATION||DISK INSTALLED|
|M.2 Slot 1||Samsung 980 PRO 2TB|
|M.2 Slot 2||Intel 665p 2TB|
|Cage 1: A||empty|
|Cage 1: B||ST8000DM004|
|Cage 1: C||ST8000DM004|
|Cage 2: A||ST8000DM004|
|Cage 2: B||ST8000DM004|
|Cage 2: C||ST4000DM004|
|Cage 3: A||ST4000DM004|
|Cage 3: B||ST2000DM006|
|Cage 3: C||WD15EADS|
The Corsair Obsidian 750D affords more disks than the venerable old Cooler Master HAF 932. The top most cages actually locks to the DVD bay cage to secure them leaving room galore for video cards galore. Larger capacity disks have been accumulated and in time even larger disks will come down in price.
Still for several years the studio made do with several comparatively small hard disks. Now with substantially larger disks the pressure on storage is reduced. The old period of 500GB disks were less problematic as games were not as larger as they are now. The Seagate ST3000DM001 was reputed to have a high failure rate but the one disk in the studio has survived. The Toshiba DT01ACA300 has less use on it but the limited capacity has still been viable.
- SEAGATE BARRACUDA COMPUTE HARD DISK SERIES
- SEAGATE EXOS X18 HARD DISK LINEUP
- TOSHIBA MG SERIES HARD DISKS
- WD RED PLUS HARD DISK SERIES
- WD RED HARD DISK SERIES
- WD BLUE HARD DISK SERIES
- WD BLUE 3D SERIES SATA SSD
- WD GREEN HARD DISK SERIES
The Comfast AX210 WiFi card provides network access. With an extended reach antenna, the AX210 can be faster than the 1000BASE-T Ethernet when connected to a modern 802.11ax access point that supports the wider 160 MHz channels. The Bluetooth affords using a mobile phone to secure the machine when out of the office.
A USB front panel box affords USB-C on the front panel. The rear I/O on the X570-A PRO has one USB-C port as well. This affords the opportunity for new peripherals as time progresses. USB-C affords higher speeds which will allow for new opportunities for higher performance media etc. USB-C graphics are used by Apple users for some applications.
Currently there is an LG WH16NS60 BD drives installed in the machine. The drive came with Cyberlink PowerDVD to play media. The WH16NS60 is 4K UHD capable allowing 4K UHD BD media to be played. Leawo has a free BD player software player for those who do not have Cyberlink available.
Never cut corners on power supplies. The old HX1000i was swapped out for the AX1600i. The AX1600i the current flagship model PSU which is far more expensive. It justifies itself with incredible 80 Plus titanium efficiency. The AX1600i shows 94% when the machine has any kind of load. It saves maybe 4% over the old PSU which will pay for itself over time. Cheap bronze rated power supplies waste more energy so their true cost is higher in the face of titanium class power supplies.
Looking at the clock speed of the RTX 2080 at 1860 MHz which is substantially above the standard boost of 1710 MHz. This is proof that video cards can draw extreme amounts of power when the workload demands it. The card’s power récurremment are 215W at standard clock speed with 240W at 1710 MHz so the higher clock speed can push the power draw to 275W or even more. All that holds the RTX 2080 back is the efficiency of the chassis cooling which demonstrated it clearly with the high clock speeds.
The AX1600i has enough 12V connections to handle dual EPS12V connectors along with pair of dual 8-pin video cards and the odd video card wants triple 8-pin PCIe power cables. Corsair has pigtail PCIe cables and testing them with demanding video cards show they work fine up to 300W of power. The AX1600i has 10 EPS12V/PCIe cable connectors to support demanding systems easily. Boards with an ATX12V connector can ignore it as the EPS12V power is quite adequate. Some elite motherboards have dual EPS12V connectors to power the slots.
The 1600W capacity means that dual cards are not a problem. Workstation cards can be demanding when rendering scenes for movies on the other hand are more transient and demand can vary by 70% or more. Having a larger reserve of power means that the turbo features are not starving. Some workstation cards like the Radeon Pro Duo Games are dual GPU cards. Dual GPU cards tend to be extremely demanding.
With an abundance of peripheral power connections it affords a power cable for each disk cage easily. Another power cable runs the H115i and the Commander Pro which also runs the fans. The front USB boxes and the BD drive also have their own cable so that charging ports are well supplied. By eliminating extension cables, power losses are reduced considerably. The motherboard has power monitoring and so does the Commander Pro so this affords a detailed look at power. An extension to the Commander Pro showed a 15% loss in voltage which motivated a separate circuit.
Less expensive power supplies have fewer peripheral and PCIe power connectors. Chassis like the Carbide SPEC-1 have a 4 disk cage so one power cable handles it fine. The larger Obsidian 750D simply needs more cables.
WATER COOLING AND FAN CONTROL
The Corsair H115i RGB PRO handles the CPU cooling. It is top mounted with the fans pushing air up through the radiator and out the top, The H115i has two fan control headers to ensure there are available resources.
The Corsair Commander Pro is mounted under the motherboard on the back of the tray. It provides USB connectivity for the water cooler and the PSU. The chassis fans are also connected to the Commander Pro so that they can all be managed more easily.
A dedicated PSU cable makes sure adequate power is available for the water cooler and the Commander Pro. Most of the hardware needs 12V power but the SATA power cable has 3.3V and 5V in addition to 12V. LED strands and fans etc all use 12V which is the standard in the modern PC. The Commander Pro can monitor voltages which can help assure cables are connected properly.
THE LCD AND MEDIA
The LG 27UL500-W is a high quality IPS HDR10 display. This allows for far better screenshots for the game reviews as well as for sharing on social media.
The LG panel with 3840×2160 resolution needs all the CU I can afford. The panel supports the HDR10 standard introduced with Windows 10 version 1909. HDR10 is what used to be called deep color 10 years ago with expensive professional class monitors. Essentially IPS is able to produce over 1 billion colors easily so 10-bit RGB is practical and now this is much more affordable as LG has done wonders for reducing the costs.
The LG panel has excellent color quality. Whether its from a mobile device or a professional studio, imagines are all excelled. Editing images is easily done with lots of pixels to spare when removing a fold from a damaged photograph.
The LD BD drive handles CD, DVD and BD media easily. Many have long ago dispensed the optical drive but imparting music into iTunes requires the services of the BD drive.
At present 4K BD discs are priced much higher than conventional FullHD BD media, Over time 4K media prices should soften as prices for televisions continue to fall and competition from DVD and BD media. Further down the road when 8K televisions become more affordable there will likely be an 8K variant of the optical disk.