[NAME]  If you're in UK, then CCL have three different nVidia GeForce 1030 cards at reasonable prices both on their own site here, here and here and via Amazon.  These are a few generations old and definitely not what gamers or miners want, but offer improved performance over your Radeon HD 5770.  Each offers different connections, so you'd need to choose the most appropriate for your current setup. BTW I wouldn't buy second hand GPUs around the same age as your Radeon as they are as likely to develop faults quite soon, if not being sold faulty.
Hello there - I need a recommendation for a suitable replacement GPU for Radeon HD 5770? As the XPS 8100 is quite old, it is only used for simple tasks e.g. surfing, word processing etc., so high performance is not required - this should be reflected in the cost of the new GPU. Many thanks for your kind assistance. Best, RPc
Studio XPS 8100 - Replacement GPU for Radeon HD 5770