Diamond Radeon HD5770 XOC Reviewjlqrb -
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Even with this being an overclocked version of the HD 5770 graphics card, Diamond has decided to stick with the dual-slot reference cooler. The use of ATI's cooler over an aftermarket design should work fine, as the HD 5770 does not excessively create heat and the fan can be turned up for better cooling using the Catalyst Control Center if the chip is running hot. Looking the card over, you can see that most of it is solid black, with a few red areas throughout the cooler. This red and black color scheme looks nice and for additional appeal there is a sticker on the card continuing with the Dirt 2 theme that is found on the packaging. This sticker is of a Mitsubishi Lancer Evolution X, which is one of the cars featured in the game. The listed measurements of this card is 8.6" with the cooler on, which means you won't have any clearance issues that you might find with the larger HD5870 or HD5970 graphic cards. Like most other HD 5770 cards, this one uses the PCIe 2.0 standard, but is backwards compatible, allowing it to be used in previous generation PCIe slots. For additional gaming power, CrossFire is supported by dual interconnects located near the rear bracket of the card.
For expansion, the Diamond HD 5770 OCX comes with enough ports to easily set up single or multiple displays with the use of Eyefinity. From left to right, you have a Display-Port, HDMI port and two Dual-Link DVI-I ports. To utilize Eyefinity you will need to use both the DVI-I ports and the Display-Port, so you will either need to have a monitor that supports these connections or an adapter ready to properly setup a three-panel display. Besides the video outputs, the bracket also has a small ventilation hole, which is where the majority of hot air form the card will be removed. With this being such a small ventilation area, not all air will be able to pass though, so there are also ventilation holes found on the side of the card that sits opposite of the motherboard. To power the graphics card beyond the 75w supplied by the PCIe slot, you will need to use the additional 6-pin power connector that is located in the right ventilation hole, near the GPU fan. It is recommended that you use a power supply that is at least 450watt or greater for a single card and a 600watt power supply for CrossFire. In addition, you obviously need to use a PSU that has enough 6-pin power cables for your needs.
The Diamond HD 5770 XOC is built on the RV480 Juniper core, which is manufactured on a 40nm process. This core has 800 stream processors, 1.4 billion transistors, 16 ROP units, and 40 texture units all on a 170mm die. As an overclocked version, the clock speed difference between this card and the reference design is 80MHz, making the core clocked at 930MHz, instead of 850MHz. Like other HD 57XX series cards, the memory bus is 128-bit, and this card comes with 1GB GDDR5 memory clocked at 1300MHz (5.2Gbps), giving it a total memory bandwidth up to 81.3GB/s. This is also an increase over stock, as standard versions come with the memory at 1200MHz. Looking at the memory chips, you will see that this card uses a total of eight Hynix memory chips with the model number H5GQ1H24AFR found on them. To cool the memory chips that are under the GPU cooler, Diamond uses a curved metal heatsink design. It is nice to see memory cooling, but unfortunately, the four memory chips on the other side of the PCB do not have any added cooling. In the last image below, you can see the disassembled GPU cooler, which uses a relatively small metal heatsink to transfer heat away from the core, which is then removed out the ventilation holes by force of the attached fan.
So, now that we have dissected the card and understand the hardware, we can put it in the test system and see just how much performance the faster clock speeds produce.