HIS Radeon HD 7770 GHz Edition Graphics Card Review
Product: HIS Radeon HD 7770 GHz Edition
Company: HIS
Author: James Prior
Editor: Charles Oliver
Date: October 25th, 2012
Test System & Overclocking
Our test platform is as detailed below:
Test Platform
| Component | Specification |
| Mainboard | ASUS P8P67 WS Revolution |
| Processor | Core i7-2600K |
| Graphics Card | HIS Radeon HD 7770 iCooler |
| AMD Radeon HD 7770 | |
| Memory | 4x2GB G-Skill RipJaws DDR3-1333 8-8-8-24 3T |
| Audio | Realtek ALC892 |
| PSU | Corsair HX850 |
| Case | CoolerMaster HAF X w/Adt'l 200mm Top Exhaust |
| OS Drive | Samsung 830 128GB SSD |
| Storage Drive | Seagate 7200.12 1TB |
| Heatsink/Fan | Noctua NH-D14 |
| Display | ASUS VG-236 24" |
| Operating System | Windows 7 64-bit Ultimate SP1 |
| Driver | Catalyst 12.9b CAP 1 |
Product Specification Comparison
| HIS HD 7770 iCooler | HD 7770 Ref | |
| SEP (USD) | $129 (-$15MIR) | $109 |
| Engine Clock | 1000Mhz | 1000MHz |
| Cores | 640 | 640 |
| Architecture | Cape Verde GCN | Cape Verde GCN |
| Memory Capacity | 1GB | 1GB |
| Memory Speed | 1125MHz / 4.5Gbps QDR | 1125MHz / 4.5Gbps QDR |
| Bus Width | 128-bit | 128-bit |
| Power [Idle/Avg/Limit] | <3W / 80W / 100W | <3W / 80W / 100W |
Overclocking
We used HIS iTurbo software for overclocking, which allows voltage control and powertune adjustment from a single interface. Our AMD Radeon HD 7770 engineering sample maxed out the engine clock at 1160MHz using 1.274v and 1275MHz on the memory, at 16% increase on the core and 13% increase on the memory. The HIS HD Radeon HD 7770 went further with less, running 1220MHz @ 1.262v on the engine clock. The memory was able to hit 1600MHz when not overclocking the core, but combining the memory and engine overclocks dropped this to 1490MHz. This gives a final increase of 22% on the engine and 32% on the memory clock.
|
Stock HD 7770
|
iCooler Overclock
|
| HIS HD 7770 iCooler | Overclock | Increase | |
| Engine Clock | 1000Mhz | 1220MHz | +22% |
| Memory Speed | 1125MHz / 4.5Gbps QDR | 1490MHz / 5.96Gbps QDR | +32% |
Multi-GPU is also supported on these cards, running with two cards in alternate frame render mode - CrossFireX. In this mode we opted to keep both cards at their individual OCs, running different clocks. Overclocking in Crossfire requires disabling AMD's ultra-low power state (ULPS) ability, which increase idle power draw.
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